Is there any native function to convert json to url parameters?

Is there any native function to convert json to url parameters? - javascript

I need convert json object to url form like: "parameter=12&asd=1"
I done with this:
var data = {
'action':'actualiza_resultado',
'postID': 1,
'gl': 2,
'gl2' : 3
};
var string_=JSON.stringify(data);
string_=string_.replace(/{/g, "");
string_=string_.replace(/}/g, "");
string_=string_.replace(/:/g, "=")
string_=string_.replace(/,/g, "&");
string_=string_.replace(/"/g, "");
But i wonder if there any function in javascript or in JSON object to do this?

Use the URLSearchParams interface, which is built into browsers and Node.js starting with version 10, released in 2018.
const myParams = {'foo': 'hi there', 'bar': '???'};
const u = new URLSearchParams(myParams).toString();
console.log(u);
Old answer: jQuery provides param that does exactly that. If you don't use jquery, take at look at the source.
Basically, it goes like this:
url = Object.keys(data).map(function(k) {
return encodeURIComponent(k) + '=' + encodeURIComponent(data[k])
}).join('&')

Using ES6 syntax:
var data = {
'action':'actualiza_resultado',
'postID': 1,
'gl': 2,
'gl2' : 3
};
let urlParameters = Object.entries(data).map(e => e.join('=')).join('&');
console.log(urlParameters);

I made an implementation that support nested objects and arrays i.e.
var data = {
users: [
{
"name": "jeff",
"tasks": [
"Do one thing",
"Do second thing"
]
},
{
"name": "rick",
"tasks": [
"Never gonna give you up",
"Never gonna let you down"
]
}
]
}
Will be:
users[0][name]=jeff&users[0][tasks][0]=Do%20one%20thing&users[0][tasks][1]=Do%20second%20thing&users[1][name]=rick&users[1][tasks][0]=Never%20gonna%20give%20you%20up&users[1][tasks][1]=Never%20gonna%20let%20you%20down
So, here's the implementation:
var isObj = function(a) {
if ((!!a) && (a.constructor === Object)) {
return true;
}
return false;
};
var _st = function(z, g) {
return "" + (g != "" ? "[" : "") + z + (g != "" ? "]" : "");
};
var fromObject = function(params, skipobjects, prefix) {
if (skipobjects === void 0) {
skipobjects = false;
}
if (prefix === void 0) {
prefix = "";
}
var result = "";
if (typeof(params) != "object") {
return prefix + "=" + encodeURIComponent(params) + "&";
}
for (var param in params) {
var c = "" + prefix + _st(param, prefix);
if (isObj(params[param]) && !skipobjects) {
result += fromObject(params[param], false, "" + c);
} else if (Array.isArray(params[param]) && !skipobjects) {
params[param].forEach(function(item, ind) {
result += fromObject(item, false, c + "[" + ind + "]");
});
} else {
result += c + "=" + encodeURIComponent(params[param]) + "&";
}
}
return result;
};
var data = {
users: [{
"name": "jeff",
"tasks": [
"Do one thing",
"Do second thing"
]
},
{
"name": "rick",
"tasks": [
"Never gonna give you up",
"Never gonna let you down"
]
}
]
}
document.write(fromObject(data));

You don't need to serialize this object literal.
Better approach is something like:
function getAsUriParameters(data) {
var url = '';
for (var prop in data) {
url += encodeURIComponent(prop) + '=' +
encodeURIComponent(data[prop]) + '&';
}
return url.substring(0, url.length - 1)
}
getAsUriParameters(data); //"action=actualiza_resultado&postID=1&gl=2&gl2=3"

Something I find nicely looking in ES6:
function urlfy(obj) {
return Object
.keys(obj)
.map(k => `${encodeURIComponent(k)}=${encodeURIComponent(obj[k])}`)
.join('&');
}
Later update (same thing, maybe a bit cleaner):
const urlfy = obj => Object
.keys(obj)
.map(k => encodeURIComponent(k) + '=' + encodeURIComponent(obj[k]))
.join('&');

Like #georg said, you can use JQuery.param for flat objects.
If you need to process complex objects, you can use JsonUri, a python package that does just that. There is JavaScript library for it as well
Disclaimer: I am the author of JSONURI
Edit: I learned much later that you can also just base64 encode your payload - most languages as support for base64 encoding/decoding
Example
x = {name: 'Petter', age: 47, places: ['Mozambique', 'Zimbabwe']}
stringRep = JSON.stringify(x)
encoded = window.btoa(stringRep)
Gives you eyJuYW1lIjoiUGV0dGVyIiwiYWdlIjo0NywicGxhY2VzIjpbIk1vemFtYmlxdWUiLCJaaW1iYWJ3ZSJdfQ==, which you can use as a uri parameter
decoded = window.atob(encoded)
originalX = JSON.parse(decoded)
Needless to say, it comes with its own caveats

But i wonder if there any function in javascript
Nothing prewritten in the core.
or json to do this?
JSON is a data format. It doesn't have functions at all.
This is a relatively trivial problem to solve though, at least for flat data structures.
Don't encode the objects as JSON, then:
function obj_to_query(obj) {
var parts = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
parts.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key]));
}
}
return "?" + parts.join('&');
}
alert(obj_to_query({
'action': 'actualiza_resultado',
'postID': 1,
'gl': 2,
'gl2': 3
}));
There isn't a standard way to encode complex data structures (e.g. with nested objects or arrays). It wouldn't be difficult to extend this to emulate the PHP method (of having square brackets in field names) or similar though.

This one processes arrays with by changing the nameinto mutiple name[]
function getAsUriParameters (data) {
return Object.keys(data).map(function (k) {
if (_.isArray(data[k])) {
var keyE = encodeURIComponent(k + '[]');
return data[k].map(function (subData) {
return keyE + '=' + encodeURIComponent(subData);
}).join('&');
} else {
return encodeURIComponent(k) + '=' + encodeURIComponent(data[k]);
}
}).join('&');
};

Best solution for Vanilla JavaScript:
var params = Object.keys(data)
.filter(function (key) {
return data[key] ? true : false
})
.map(function (key) {
return encodeURIComponent(key) + '=' + encodeURIComponent(data[key])
})
.join('&');
PS: The filter is used here to remove null or undefined parameters. It makes the url look cleaner.

The custom code above only handles flat data. And JQuery is not available in react native. So here is a js solution that does work with multi-level objects and arrays in react native.
function formurlencoded(data) {
const opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
let sorted = Boolean(opts.sorted),
skipIndex = Boolean(opts.skipIndex),
ignorenull = Boolean(opts.ignorenull),
encode = function encode(value) {
return String(value).replace(/(?:[\0-\x1F"-&\+-\}\x7F-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF])/g, encodeURIComponent).replace(/ /g, '+').replace(/[!'()~\*]/g, function (ch) {
return '%' + ch.charCodeAt().toString(16).slice(-2).toUpperCase();
});
},
keys = function keys(obj) {
const keyarr = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Object.keys(obj);
return sorted ? keyarr.sort() : keyarr;
},
filterjoin = function filterjoin(arr) {
return arr.filter(function (e) {
return e;
}).join('&');
},
objnest = function objnest(name, obj) {
return filterjoin(keys(obj).map(function (key) {
return nest(name + '[' + key + ']', obj[key]);
}));
},
arrnest = function arrnest(name, arr) {
return arr.length ? filterjoin(arr.map(function (elem, index) {
return skipIndex ? nest(name + '[]', elem) : nest(name + '[' + index + ']', elem);
})) : encode(name + '[]');
},
nest = function nest(name, value) {
const type = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : typeof value === 'undefined' ? 'undefined' : typeof(value);
let f = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : null;
if (value === f) f = ignorenull ? f : encode(name) + '=' + f; else if (/string|number|boolean/.test(type)) f = encode(name) + '=' + encode(value); else if (Array.isArray(value)) f = arrnest(name, value); else if (type === 'object') f = objnest(name, value);
return f;
};
return data && filterjoin(keys(data).map(function (key) {
return nest(key, data[key]);
}));
}

The conversion from a JSON string to a URL query string can be done in a single line:
const json = '{"action":"actualiza_resultado","postID":1,"gl":2,"gl2":3}';
const queryString = new URLSearchParams(JSON.parse(json)).toString();
queryString would then be set to "action=actualiza_resultado&postID=1&gl=2&gl2=3".

Based on georg's answer, but also adding ? before the string and using ES6:
const query = !params ? '': Object.keys(params).map((k, idx) => {
let prefix = '';
if (idx === 0) {
prefix = '?';
}
return prefix + encodeURIComponent(k) + '=' + encodeURIComponent(params[k]);
}).join('&');

As most of the answers only convert flat objects to query parameters, I would like to share mine.
This function can handle flat objects, as well as nested arrays/objects while only using plain JS.
function incapsulateInBrackets(key)
{
return '[' + key + ']';
}
function encode(object, isSubEncode=false, prefix = '')
{
let parts = Object.keys(object).map( (key) => {
let encodedParts = [];
if(Array.isArray(object[key]))
{
object[key].map(function(innerKey, index){
encodedParts.push( encode(object[key][index], true, prefix + key + incapsulateInBrackets(index)));
});
}
else if(object[key] instanceof Object)
{
Object.keys(object[key]).map( (innerKey) => {
if(Array.isArray(object[key][innerKey]))
{
encodedParts.push( encode(object[key][index], true, prefix + incapsulateInBrackets(key) + incapsulateInBrackets(innerKey)) );
}
else
{
encodedParts.push( prefix + incapsulateInBrackets(key) + incapsulateInBrackets(innerKey) + '=' + object[key][innerKey] );
}
});
}
else
{
if(isSubEncode)
{
encodedParts.push( prefix + incapsulateInBrackets(key) + '=' + object[key] );
}
else
{
encodedParts.push( key + '=' + object[key] );
}
}
return encodedParts.join('&');
});
return parts.join('&');
}

Make a utility if you have nodejs
const querystring = require('querystring')
export function makeQueryString(params): string {
return querystring.stringify(params)
}
import example
import { makeQueryString } from '~/utils'
example of use
makeQueryString({
...query,
page
})
Read the latest documentation here.

Related

query string takes off last ')' in url

I am constructing a query string in Javascript based on whether a checkbox is checked or not.
Some of the options in the checkboxes are
"Annual"
"Grass"
"Shrub (Evergreen)"
"Shrub (Deciduous)"
I found a function online that updates the url parameter:
function updateUrlParameter(uri, key, value) {
value = value.replace(/\s/g, "%20");
var i = uri.indexOf('#');
var hash = i === -1 ? '' : uri.substr(i);
uri = i === -1 ? uri : uri.substr(0, i);
var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
var separator = uri.indexOf('?') !== -1 ? "&" : "?";
if (!value) {
// remove key-value pair if value is empty
uri = uri.replace(new RegExp("([&]?)" + key + "=.*?(&|$)", "i"), '');
if (uri.slice(-1) === '?') {
uri = uri.slice(0, -1);
}
} else {
console.log("value is " + value)
uri = uri + separator + key + "=" + value;
}
return uri + hash;
}
Using the above function, if I check the checkboxes for the above four starting from top down, my query string becomes
?plantType=Annual&plantType=Grass&plantType=Shrub%20(Evergreen)&plantType=Shrub%20(Deciduous
Why is the function ignoring the last ')' in the string? Is there a work around this? I would like to keep the parenthesis in the query string because this will make querying the database easier.
I created a function to iterate through input checkboxes. If they are checked, then use the updateUrlParameter function to update the URI.
function getQueryString() {
var inputsContainerChildren = $('#floatingDivForFilter').children();
var input = document.createElement('input')
var uri = '';
for (var i = 0; i < inputsContainerChildren.length; i++) {
var currChild = inputsContainerChildren[i].firstElementChild;
if (currChild) {
if (currChild.tagName === 'INPUT') {
if (currChild.checked) {
var id = currChild.id;
console.log(uri)
uri = updateUrlParameter(uri, currChild.name, currChild.value);
}
}
}
}
console.log(uri);
}
The photo below shows a snapshot of the URL produced. I can't figure out why the last ')' is chopped off.
url photo

The issue you are seeing is just the Chrome developer tools trying to be too clever.
When logging the url to the console, Chrome will not recognize the full url as a link but exclude the closing ")". They probably do that because it will be very common that people write an url in braces and it is not expected that the closing brace is part of the url.
Since this is only an issue of the developer tools, you can ignore the issue. It will not affect the runtime behaviour of your code.
The issue will be solved when you correctly escape special characters in the parameters (as you should do anyway):
function updateUrlParameter(uri, key, value) {
// removed because escape will do that
// value = value.replace(/\s/g, "%20");
var i = uri.indexOf('#');
var hash = i === -1 ? '' : uri.substr(i);
uri = i === -1 ? uri : uri.substr(0, i);
var separator = uri.indexOf('?') !== -1 ? "&" : "?";
if (!value) {
// remove key-value pair if value is empty
uri = uri.replace(new RegExp("([&]?)" + key + "=.*?(&|$)", "i"), '');
if (uri.slice(-1) === '?') {
uri = uri.slice(0, -1);
}
} else {
console.log("value is " + value)
// Use escape on key and value
uri = uri + separator + escape(key) + "=" + escape(value);
}
return uri + hash;
}
let s = "http://chrome.is.too.clever/";
s = updateUrlParameter(s, "plantType", "Annual");
s = updateUrlParameter(s, "plantType", "Grass");
s = updateUrlParameter(s, "plantType", "Shrub (Evergreen)");
s = updateUrlParameter(s, "plantType", "Shrub (Deciduous)");
console.log(s);
Fiddle

Instead of using a regular expression, just convert the params to an object, modify said object, and convert it back into params.
var url = 'https://x.y?plantType=Annual&plantType=Grass&plantType=Shrub%20(Evergreen)&plantType=Shrub%20(Deciduous)';
function updateUrlParameter(uri, key, value) {
let url = new URL(uri), object = deserializeQuery(url.search); // params to obj
object[key] = value; // modify obj
return url.origin + '?' + serializeQuery(object); // obj to url + params
}
console.log(updateUrlParameter(url, 'plantType', [ 'Pine', 'Palm', 'Rose (Red)' ]));
/** ======= Serialization / Deserialization functions below ======== */
// https://stackoverflow.com/a/47517503/1762224
function deserializeQuery(queryString, queryKey) {
let query = {}, pairs = (queryString[0] === '?' ? queryString.substr(1) : queryString).split('&');
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i].split('='), key = decodeURIComponent(pair[0]), value = decodeURIComponent(pair[1] || '');
value = (value.indexOf(',') === -1 ? value : value.split(','));
query[key] = query[key] ? (query[key].constructor === Array ? query[key].concat(value) : [query[key], value]) : value;
}
return typeof queryKey === 'undefined' ? query : query[queryKey];
}
// https://stackoverflow.com/a/53528203/1762224
function serializeQuery(params, keys = [], isArray = false) {
const p = Object.keys(params).map(key => {
let val = params[key];
if ("[object Object]" === Object.prototype.toString.call(val) || Array.isArray(val)) {
keys.push(Array.isArray(params) ? "" : key);
return serializeQuery(val, keys, Array.isArray(val));
} else {
let tKey = keys.length > 0 ? ((isArray ? keys : [...keys, key]).reduce((str, k) => "" === str ? k : `${str}[${k}]`, "")) : key;
if (isArray) {
return encodeURIComponent(tKey) + '=' + encodeURIComponent(val);
}
}
}).join('&');
keys.pop();
return p;
}
.as-console-wrapper {
top: 0;
max-height: 100% !important;
}
.as-console-row {
white-space: pre-wrap;
word-break: break-all;
}

How to output json prettry formt as html using javascript? [duplicate]

How can I display JSON in an easy-to-read (for human readers) format? I'm looking primarily for indentation and whitespace, with perhaps even colors / font-styles / etc.

Pretty-printing is implemented natively in JSON.stringify(). The third argument enables pretty printing and sets the spacing to use:
var str = JSON.stringify(obj, null, 2); // spacing level = 2
If you need syntax highlighting, you might use some regex magic like so:
function syntaxHighlight(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, 2);
}
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}
See in action here: jsfiddle
Or a full snippet provided below:
function output(inp) {
document.body.appendChild(document.createElement('pre')).innerHTML = inp;
}
function syntaxHighlight(json) {
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}
var obj = {a:1, 'b':'foo', c:[false,'false',null, 'null', {d:{e:1.3e5,f:'1.3e5'}}]};
var str = JSON.stringify(obj, undefined, 4);
output(str);
output(syntaxHighlight(str));
pre {outline: 1px solid #ccc; padding: 5px; margin: 5px; }
.string { color: green; }
.number { color: darkorange; }
.boolean { color: blue; }
.null { color: magenta; }
.key { color: red; }

User Pumbaa80's answer is great if you have an object you want pretty printed. If you're starting from a valid JSON string that you want to pretty printed, you need to convert it to an object first:
var jsonString = '{"some":"json"}';
var jsonPretty = JSON.stringify(JSON.parse(jsonString),null,2);
This builds a JSON object from the string, and then converts it back to a string using JSON stringify's pretty print.

Better way.
Prettify JSON Array in Javascript
JSON.stringify(jsonobj,null,'\t')

var jsonObj = {"streetLabel": "Avenue Anatole France", "city": "Paris 07", "postalCode": "75007", "countryCode": "FRA", "countryLabel": "France" };
document.getElementById("result-before").innerHTML = JSON.stringify(jsonObj);
In case of displaying in HTML, you should to add a balise <pre></pre>
document.getElementById("result-after").innerHTML = "<pre>"+JSON.stringify(jsonObj,undefined, 2) +"</pre>"
Example:
var jsonObj = {"streetLabel": "Avenue Anatole France", "city": "Paris 07", "postalCode": "75007", "countryCode": "FRA", "countryLabel": "France" };
document.getElementById("result-before").innerHTML = JSON.stringify(jsonObj);
document.getElementById("result-after").innerHTML = "<pre>"+JSON.stringify(jsonObj,undefined, 2) +"</pre>"
div { float:left; clear:both; margin: 1em 0; }
<div id="result-before"></div>
<div id="result-after"></div>

Based on Pumbaa80's answer I have modified the code to use the console.log colours (working on Chrome for sure) and not HTML. Output can be seen inside console. You can edit the _variables inside the function adding some more styling.
function JSONstringify(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, '\t');
}
var
arr = [],
_string = 'color:green',
_number = 'color:darkorange',
_boolean = 'color:blue',
_null = 'color:magenta',
_key = 'color:red';
json = json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var style = _number;
if (/^"/.test(match)) {
if (/:$/.test(match)) {
style = _key;
} else {
style = _string;
}
} else if (/true|false/.test(match)) {
style = _boolean;
} else if (/null/.test(match)) {
style = _null;
}
arr.push(style);
arr.push('');
return '%c' + match + '%c';
});
arr.unshift(json);
console.log.apply(console, arr);
}
Here is a bookmarklet you can use:
javascript:function JSONstringify(json) {if (typeof json != 'string') {json = JSON.stringify(json, undefined, '\t');}var arr = [],_string = 'color:green',_number = 'color:darkorange',_boolean = 'color:blue',_null = 'color:magenta',_key = 'color:red';json = json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {var style = _number;if (/^"/.test(match)) {if (/:$/.test(match)) {style = _key;} else {style = _string;}} else if (/true|false/.test(match)) {style = _boolean;} else if (/null/.test(match)) {style = _null;}arr.push(style);arr.push('');return '%c' + match + '%c';});arr.unshift(json);console.log.apply(console, arr);};void(0);
Usage:
var obj = {a:1, 'b':'foo', c:[false,null, {d:{e:1.3e5}}]};
JSONstringify(obj);
Edit: I just tried to escape the % symbol with this line, after the variables declaration:
json = json.replace(/%/g, '%%');
But I find out that Chrome is not supporting % escaping in the console. Strange... Maybe this will work in the future.
Cheers!

I think you're looking for something like this :
JSON.stringify(obj, null, '\t');
This "pretty-prints" your JSON string, using a tab for indentation.
If you prefer to use spaces instead of tabs, you could also use a number for the number of spaces you'd like :
JSON.stringify(obj, null, 2);

You can use console.dir(), which is a shortcut for console.log(util.inspect()).
(The only difference is that it bypasses any custom inspect() function defined on an object.)
It uses syntax-highlighting, smart indentation, removes quotes from keys and just makes the output as pretty as it gets.
const object = JSON.parse(jsonString)
console.dir(object, {depth: null, colors: true})
and for the command line:
cat package.json | node -e "process.stdin.pipe(new stream.Writable({write: chunk => console.dir(JSON.parse(chunk), {depth: null, colors: true})}))"

I use the JSONView Chrome extension (it is as pretty as it gets :):
Edit: added jsonreport.js
I've also released an online stand-alone JSON pretty print viewer, jsonreport.js, that provides a human readable HTML5 report you can use to view any JSON data.
You can read more about the format in New JavaScript HTML5 Report Format.

If you are using ES5, simply call JSON.stringify with:
2nd arg: replacer; set to null,
3rd arg: space; use tab.
JSON.stringify(anObject, null, '\t');
Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Here's user123444555621's awesome HTML one adapted for terminals. Handy for debugging Node scripts:
function prettyJ(json) {
if (typeof json !== 'string') {
json = JSON.stringify(json, undefined, 2);
}
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
function (match) {
let cls = "\x1b[36m";
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = "\x1b[34m";
} else {
cls = "\x1b[32m";
}
} else if (/true|false/.test(match)) {
cls = "\x1b[35m";
} else if (/null/.test(match)) {
cls = "\x1b[31m";
}
return cls + match + "\x1b[0m";
}
);
}
Usage:
// thing = any json OR string of json
prettyJ(thing);

For debugging purpose I use:
console.debug("%o", data);
https://getfirebug.com/wiki/index.php/Console_API
https://developer.mozilla.org/en-US/docs/DOM/console

You can use JSON.stringify(your object, null, 2)
The second parameter can be used as a replacer function which takes key and Val as parameters.This can be used in case you want to modify something within your JSON object.
more reference : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Unsatisfied with other pretty printers for Ruby, I wrote my own (NeatJSON) and then ported it to JavaScript including a free online formatter. The code is free under MIT license (quite permissive).
Features (all optional):
Set a line width and wrap in a way that keeps objects and arrays on the same line when they fit, wrapping one value per line when they don't.
Sort object keys if you like.
Align object keys (line up the colons).
Format floating point numbers to specific number of decimals, without messing up the integers.
'Short' wrapping mode puts opening and closing brackets/braces on the same line as values, providing a format that some prefer.
Granular control over spacing for arrays and objects, between brackets, before/after colons and commas.
Function is made available to both web browsers and Node.js.
I'll copy the source code here so that this is not just a link to a library, but I encourage you to go to the GitHub project page, as that will be kept up-to-date and the code below will not.
(function(exports){
exports.neatJSON = neatJSON;
function neatJSON(value,opts){
opts = opts || {}
if (!('wrap' in opts)) opts.wrap = 80;
if (opts.wrap==true) opts.wrap = -1;
if (!('indent' in opts)) opts.indent = ' ';
if (!('arrayPadding' in opts)) opts.arrayPadding = ('padding' in opts) ? opts.padding : 0;
if (!('objectPadding' in opts)) opts.objectPadding = ('padding' in opts) ? opts.padding : 0;
if (!('afterComma' in opts)) opts.afterComma = ('aroundComma' in opts) ? opts.aroundComma : 0;
if (!('beforeComma' in opts)) opts.beforeComma = ('aroundComma' in opts) ? opts.aroundComma : 0;
if (!('afterColon' in opts)) opts.afterColon = ('aroundColon' in opts) ? opts.aroundColon : 0;
if (!('beforeColon' in opts)) opts.beforeColon = ('aroundColon' in opts) ? opts.aroundColon : 0;
var apad = repeat(' ',opts.arrayPadding),
opad = repeat(' ',opts.objectPadding),
comma = repeat(' ',opts.beforeComma)+','+repeat(' ',opts.afterComma),
colon = repeat(' ',opts.beforeColon)+':'+repeat(' ',opts.afterColon);
return build(value,'');
function build(o,indent){
if (o===null || o===undefined) return indent+'null';
else{
switch(o.constructor){
case Number:
var isFloat = (o === +o && o !== (o|0));
return indent + ((isFloat && ('decimals' in opts)) ? o.toFixed(opts.decimals) : (o+''));
case Array:
var pieces = o.map(function(v){ return build(v,'') });
var oneLine = indent+'['+apad+pieces.join(comma)+apad+']';
if (opts.wrap===false || oneLine.length<=opts.wrap) return oneLine;
if (opts.short){
var indent2 = indent+' '+apad;
pieces = o.map(function(v){ return build(v,indent2) });
pieces[0] = pieces[0].replace(indent2,indent+'['+apad);
pieces[pieces.length-1] = pieces[pieces.length-1]+apad+']';
return pieces.join(',\n');
}else{
var indent2 = indent+opts.indent;
return indent+'[\n'+o.map(function(v){ return build(v,indent2) }).join(',\n')+'\n'+indent+']';
}
case Object:
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [JSON.stringify(k), build(o[k],'')];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
keyvals = keyvals.map(function(kv){ return kv.join(colon) }).join(comma);
var oneLine = indent+"{"+opad+keyvals+opad+"}";
if (opts.wrap===false || oneLine.length<opts.wrap) return oneLine;
if (opts.short){
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [indent+' '+opad+JSON.stringify(k),o[k]];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
keyvals[0][0] = keyvals[0][0].replace(indent+' ',indent+'{');
if (opts.aligned){
var longest = 0;
for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
var padding = repeat(' ',longest);
for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
}
for (var i=keyvals.length;i--;){
var k=keyvals[i][0], v=keyvals[i][1];
var indent2 = repeat(' ',(k+colon).length);
var oneLine = k+colon+build(v,'');
keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
}
return keyvals.join(',\n') + opad + '}';
}else{
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [indent+opts.indent+JSON.stringify(k),o[k]];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
if (opts.aligned){
var longest = 0;
for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
var padding = repeat(' ',longest);
for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
}
var indent2 = indent+opts.indent;
for (var i=keyvals.length;i--;){
var k=keyvals[i][0], v=keyvals[i][1];
var oneLine = k+colon+build(v,'');
keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
}
return indent+'{\n'+keyvals.join(',\n')+'\n'+indent+'}'
}
default:
return indent+JSON.stringify(o);
}
}
}
function repeat(str,times){ // http://stackoverflow.com/a/17800645/405017
var result = '';
while(true){
if (times & 1) result += str;
times >>= 1;
if (times) str += str;
else break;
}
return result;
}
function padRight(pad, str){
return (str + pad).substring(0, pad.length);
}
}
neatJSON.version = "0.5";
})(typeof exports === 'undefined' ? this : exports);

Thanks a lot #all!
Based on the previous answers, here is another variant method providing custom replacement rules as parameter:
renderJSON : function(json, rr, code, pre){
if (typeof json !== 'string') {
json = JSON.stringify(json, undefined, '\t');
}
var rules = {
def : 'color:black;',
defKey : function(match){
return '<strong>' + match + '</strong>';
},
types : [
{
name : 'True',
regex : /true/,
type : 'boolean',
style : 'color:lightgreen;'
},
{
name : 'False',
regex : /false/,
type : 'boolean',
style : 'color:lightred;'
},
{
name : 'Unicode',
regex : /"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?/,
type : 'string',
style : 'color:green;'
},
{
name : 'Null',
regex : /null/,
type : 'nil',
style : 'color:magenta;'
},
{
name : 'Number',
regex : /-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/,
type : 'number',
style : 'color:darkorange;'
},
{
name : 'Whitespace',
regex : /\s+/,
type : 'whitespace',
style : function(match){
return '&nbsp';
}
}
],
keys : [
{
name : 'Testkey',
regex : /("testkey")/,
type : 'key',
style : function(match){
return '<h1>' + match + '</h1>';
}
}
],
punctuation : {
name : 'Punctuation',
regex : /([\,\.\}\{\[\]])/,
type : 'punctuation',
style : function(match){
return '<p>________</p>';
}
}
};
if('undefined' !== typeof jQuery){
rules = $.extend(rules, ('object' === typeof rr) ? rr : {});
}else{
for(var k in rr ){
rules[k] = rr[k];
}
}
var str = json.replace(/([\,\.\}\{\[\]]|"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var i = 0, p;
if (rules.punctuation.regex.test(match)) {
if('string' === typeof rules.punctuation.style){
return '<span style="'+ rules.punctuation.style + '">' + match + '</span>';
}else if('function' === typeof rules.punctuation.style){
return rules.punctuation.style(match);
} else{
return match;
}
}
if (/^"/.test(match)) {
if (/:$/.test(match)) {
for(i=0;i<rules.keys.length;i++){
p = rules.keys[i];
if (p.regex.test(match)) {
if('string' === typeof p.style){
return '<span style="'+ p.style + '">' + match + '</span>';
}else if('function' === typeof p.style){
return p.style(match);
} else{
return match;
}
}
}
return ('function'===typeof rules.defKey) ? rules.defKey(match) : '<span style="'+ rules.defKey + '">' + match + '</span>';
} else {
return ('function'===typeof rules.def) ? rules.def(match) : '<span style="'+ rules.def + '">' + match + '</span>';
}
} else {
for(i=0;i<rules.types.length;i++){
p = rules.types[i];
if (p.regex.test(match)) {
if('string' === typeof p.style){
return '<span style="'+ p.style + '">' + match + '</span>';
}else if('function' === typeof p.style){
return p.style(match);
} else{
return match;
}
}
}
}
});
if(true === pre)str = '<pre>' + str + '</pre>';
if(true === code)str = '<code>' + str + '</code>';
return str;
}

It works well:
console.table()
Read more here: https://developer.mozilla.org/pt-BR/docs/Web/API/Console/table

Here is a simple JSON format/color component written in React:
const HighlightedJSON = ({ json }: Object) => {
const highlightedJSON = jsonObj =>
Object.keys(jsonObj).map(key => {
const value = jsonObj[key];
let valueType = typeof value;
const isSimpleValue =
["string", "number", "boolean"].includes(valueType) || !value;
if (isSimpleValue && valueType === "object") {
valueType = "null";
}
return (
<div key={key} className="line">
<span className="key">{key}:</span>
{isSimpleValue ? (
<span className={valueType}>{`${value}`}</span>
) : (
highlightedJSON(value)
)}
</div>
);
});
return <div className="json">{highlightedJSON(json)}</div>;
};
See it working in this CodePen:
https://codepen.io/benshope/pen/BxVpjo
Hope that helps!

Couldn't find any solution that had good syntax highlighting for the console, so here's my 2p
Install & Add cli-highlight dependency
npm install cli-highlight --save
Define logjson globally
const highlight = require('cli-highlight').highlight
console.logjson = (obj) => console.log(
highlight( JSON.stringify(obj, null, 4),
{ language: 'json', ignoreIllegals: true } ));
Use
console.logjson({foo: "bar", someArray: ["string1", "string2"]});

I'd like to show my jsonAnalyze method here, it does a pretty print of the JSON structure only, but in some cases can be more usefull that printing the whole JSON.
Say you have a complex JSON like this:
let theJson = {
'username': 'elen',
'email': 'elen#test.com',
'state': 'married',
'profiles': [
{'name': 'elenLove', 'job': 'actor' },
{'name': 'elenDoe', 'job': 'spy'}
],
'hobbies': ['run', 'movies'],
'status': {
'home': {
'ownsHome': true,
'addresses': [
{'town': 'Mexico', 'address': '123 mexicoStr'},
{'town': 'Atlanta', 'address': '4B atlanta 45-48'},
]
},
'car': {
'ownsCar': true,
'cars': [
{'brand': 'Nissan', 'plate': 'TOKY-114', 'prevOwnersIDs': ['4532354531', '3454655344', '5566753422']},
{'brand': 'Benz', 'plate': 'ELEN-1225', 'prevOwnersIDs': ['4531124531', '97864655344', '887666753422']}
]
}
},
'active': true,
'employed': false,
};
Then the method will return the structure like this:
username
email
state
profiles[]
profiles[].name
profiles[].job
hobbies[]
status{}
status{}.home{}
status{}.home{}.ownsHome
status{}.home{}.addresses[]
status{}.home{}.addresses[].town
status{}.home{}.addresses[].address
status{}.car{}
status{}.car{}.ownsCar
status{}.car{}.cars[]
status{}.car{}.cars[].brand
status{}.car{}.cars[].plate
status{}.car{}.cars[].prevOwnersIDs[]
active
employed
So this is the jsonAnalyze() code:
function jsonAnalyze(obj) {
let arr = [];
analyzeJson(obj, null, arr);
return logBeautifiedDotNotation(arr);
function analyzeJson(obj, parentStr, outArr) {
let opt;
if (!outArr) {
return "no output array given"
}
for (let prop in obj) {
opt = parentStr ? parentStr + '.' + prop : prop;
if (Array.isArray(obj[prop]) && obj[prop] !== null) {
let arr = obj[prop];
if ((Array.isArray(arr[0]) || typeof arr[0] == "object") && arr[0] != null) {
outArr.push(opt + '[]');
analyzeJson(arr[0], opt + '[]', outArr);
} else {
outArr.push(opt + '[]');
}
} else if (typeof obj[prop] == "object" && obj[prop] !== null) {
outArr.push(opt + '{}');
analyzeJson(obj[prop], opt + '{}', outArr);
} else {
if (obj.hasOwnProperty(prop) && typeof obj[prop] != 'function') {
outArr.push(opt);
}
}
}
}
function logBeautifiedDotNotation(arr) {
retStr = '';
arr.map(function (item) {
let dotsAmount = item.split(".").length - 1;
let dotsString = Array(dotsAmount + 1).join(' ');
retStr += dotsString + item + '\n';
console.log(dotsString + item)
});
return retStr;
}
}
jsonAnalyze(theJson);

Douglas Crockford's JSON in JavaScript library will pretty print JSON via the stringify method.
You may also find the answers to this older question useful: How can I pretty-print JSON in (unix) shell script?

I ran into an issue today with #Pumbaa80's code. I'm trying to apply JSON syntax highlighting to data that I'm rendering in a Mithril view, so I need to create DOM nodes for everything in the JSON.stringify output.
I split the really long regex into its component parts as well.
render_json = (data) ->
# wraps JSON data in span elements so that syntax highlighting may be
# applied. Should be placed in a `whitespace: pre` context
if typeof(data) isnt 'string'
data = JSON.stringify(data, undefined, 2)
unicode = /"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?/
keyword = /\b(true|false|null)\b/
whitespace = /\s+/
punctuation = /[,.}{\[\]]/
number = /-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/
syntax = '(' + [unicode, keyword, whitespace,
punctuation, number].map((r) -> r.source).join('|') + ')'
parser = new RegExp(syntax, 'g')
nodes = data.match(parser) ? []
select_class = (node) ->
if punctuation.test(node)
return 'punctuation'
if /^\s+$/.test(node)
return 'whitespace'
if /^\"/.test(node)
if /:$/.test(node)
return 'key'
return 'string'
if /true|false/.test(node)
return 'boolean'
if /null/.test(node)
return 'null'
return 'number'
return nodes.map (node) ->
cls = select_class(node)
return Mithril('span', {class: cls}, node)
Code in context on Github here

If you're looking for a nice library to prettify json on a web page...
Prism.js is pretty good.
http://prismjs.com/
I found using JSON.stringify(obj, undefined, 2) to get the indentation, and then using prism to add a theme was a good approach.
If you're loading in JSON via an ajax call, then you can run one of Prism's utility methods to prettify
For example:
Prism.highlightAll()

Quick pretty human-readable JSON output in 1 line code (without colors):
document.documentElement.innerHTML='<pre>'+JSON.stringify(obj, null, 2)+'</pre>';

If you need this to work in a textarea the accepted solution will not work.
<textarea id='textarea'></textarea>
$("#textarea").append(formatJSON(JSON.stringify(jsonobject),true));
function formatJSON(json,textarea) {
var nl;
if(textarea) {
nl = "
";
} else {
nl = "<br>";
}
var tab = "    ";
var ret = "";
var numquotes = 0;
var betweenquotes = false;
var firstquote = false;
for (var i = 0; i < json.length; i++) {
var c = json[i];
if(c == '"') {
numquotes ++;
if((numquotes + 2) % 2 == 1) {
betweenquotes = true;
} else {
betweenquotes = false;
}
if((numquotes + 3) % 4 == 0) {
firstquote = true;
} else {
firstquote = false;
}
}
if(c == '[' && !betweenquotes) {
ret += c;
ret += nl;
continue;
}
if(c == '{' && !betweenquotes) {
ret += tab;
ret += c;
ret += nl;
continue;
}
if(c == '"' && firstquote) {
ret += tab + tab;
ret += c;
continue;
} else if (c == '"' && !firstquote) {
ret += c;
continue;
}
if(c == ',' && !betweenquotes) {
ret += c;
ret += nl;
continue;
}
if(c == '}' && !betweenquotes) {
ret += nl;
ret += tab;
ret += c;
continue;
}
if(c == ']' && !betweenquotes) {
ret += nl;
ret += c;
continue;
}
ret += c;
} // i loop
return ret;
}

This is nice:
https://github.com/mafintosh/json-markup from mafintosh
const jsonMarkup = require('json-markup')
const html = jsonMarkup({hello:'world'})
document.querySelector('#myElem').innerHTML = html
HTML
<link ref="stylesheet" href="style.css">
<div id="myElem></div>
Example stylesheet can be found here
https://raw.githubusercontent.com/mafintosh/json-markup/master/style.css

To highlight and beautify it in HTML using Bootstrap:
function prettifyJson(json, prettify) {
if (typeof json !== 'string') {
if (prettify) {
json = JSON.stringify(json, undefined, 4);
} else {
json = JSON.stringify(json);
}
}
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
function(match) {
let cls = "<span>";
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = "<span class='text-danger'>";
} else {
cls = "<span>";
}
} else if (/true|false/.test(match)) {
cls = "<span class='text-primary'>";
} else if (/null/.test(match)) {
cls = "<span class='text-info'>";
}
return cls + match + "</span>";
}
);
}

based on #user123444555621, just slightly more modern.
const clsMap = [
[/^".*:$/, "key"],
[/^"/, "string"],
[/true|false/, "boolean"],
[/null/, "key"],
[/.*/, "number"],
]
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span class="${clsMap.find(([regex]) => regex.test(match))[1]}">${match}</span>`);
you can also specify the colors inside js (no CSS needed)
const clsMap = [
[/^".*:$/, "red"],
[/^"/, "green"],
[/true|false/, "blue"],
[/null/, "magenta"],
[/.*/, "darkorange"],
]
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span style="color:${clsMap.find(([regex]) => regex.test(match))[1]}">${match}</span>`);
and a version with less regex
const clsMap = [
[match => match.startsWith('"') && match.endsWith(':'), "red"],
[match => match.startsWith('"'), "green"],
[match => match === "true" || match === "false" , "blue"],
[match => match === "null", "magenta"],
[() => true, "darkorange"],
];
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span style="color:${clsMap.find(([fn]) => fn(match))[1]}">${match}</span>`);

it's for Laravel, Codeigniter
Html:
<pre class="jsonPre"> </pre>
Controller: Return the JSON value from the controller as like as
return json_encode($data, JSON_PRETTY_PRINT);
In script:
<script> $('.jsonPre').html(result); </script>
result will be

Here is how you can print without using native function.
function pretty(ob, lvl = 0) {
let temp = [];
if(typeof ob === "object"){
for(let x in ob) {
if(ob.hasOwnProperty(x)) {
temp.push( getTabs(lvl+1) + x + ":" + pretty(ob[x], lvl+1) );
}
}
return "{\n"+ temp.join(",\n") +"\n" + getTabs(lvl) + "}";
}
else {
return ob;
}
}
function getTabs(n) {
let c = 0, res = "";
while(c++ < n)
res+="\t";
return res;
}
let obj = {a: {b: 2}, x: {y: 3}};
console.log(pretty(obj));
/*
{
a: {
b: 2
},
x: {
y: 3
}
}
*/

The simplest way to display an object for debugging purposes:
console.log("data",data) // lets you unfold the object manually
If you want to display the object in the DOM, you should consider that it could contain strings that would be interpreted as HTML. Therefore, you need to do some escaping...
var s = JSON.stringify(data,null,2) // format
var e = new Option(s).innerHTML // escape
document.body.insertAdjacentHTML('beforeend','<pre>'+e+'</pre>') // display

<!-- here is a complete example pretty print with more space between lines-->
<!-- be sure to pass a json string not a json object -->
<!-- use line-height to increase or decrease spacing between json lines -->
<style type="text/css">
.preJsonTxt{
font-size: 18px;
text-overflow: ellipsis;
overflow: hidden;
line-height: 200%;
}
.boxedIn{
border: 1px solid black;
margin: 20px;
padding: 20px;
}
</style>
<div class="boxedIn">
<h3>Configuration Parameters</h3>
<pre id="jsonCfgParams" class="preJsonTxt">{{ cfgParams }}</pre>
</div>
<script language="JavaScript">
$( document ).ready(function()
{
$(formatJson);
<!-- this will do a pretty print on the json cfg params -->
function formatJson() {
var element = $("#jsonCfgParams");
var obj = JSON.parse(element.text());
element.html(JSON.stringify(obj, undefined, 2));
}
});
</script>

Get the "path" of a JSON object in JavaScript

I am trying to get the "path" of an AngularJS scope variable and not having much luck. I want to eventually pass that "path" to be used as the ng-model of some dynamic forms that are being created.
Here is my code so far:
my_code.js:
var my_data = {
name: "fred",
number: 1,
children: [
{ name: "bob" },
{ name: "joe" },
{ name: "norman" },
]
};
function get_path(obj, target, path) {
if (typeof path === "undefined" || path === null) {
path = "my_data";
}
for (var key in obj) {
var value = obj[key];
var value_type = value.constructor;
/* value can either be an Array */
if (value_type === Array) {
for (var i=0; i<value.length; i++) {
if (value[i] === target) {
return path + "." + key + "[" + i + "]";
}
var result = get_path(value, target, path + "." + key + "[" + i + "]");
if (result) {
return result;
}
}
}
/* or an Object (dictionary) itself */
else if (value_type === Object) {
var result = get_path(value, target, path + "." + key);
if (result) {
return result;
}
}
/* or something atomic (string, number, etc.) */
else {
if (value === target) {
return path + "." + key;
}
}
}
return false;
}
If I pass the object my_data.children[0].name to this function, I would expect it to return the string "my_data.children[0].name". But it is actually returning "my_data.children[0].0.name". Any ideas on where I'm going wrong?
P.S. - I got the initial idea from Javascript/JSON get path to given subnode?, but that didn't handle Arrays.

I think your error is at :
else if (value_type === Object) {
var result = get_path(value, target, path + "." + key);
if (result) {
return result;
}
}
you have added "." + key. just remove it become like below:
else if (value_type === Object) {
var result = get_path(value, target, path );
if (result) {
return result;
}
}

#min-hong-tan solved the problem, and should be the accepted answer. But for completeness sake, I added the following lines:
if (value === target) {
return path + "." + key;
}
after each if block just in case I was trying to match an entire Array (as with my_data.children) or an entire Object that is not part of an Array.

Making JSON output "pretty" with CSS [duplicate]

How can I display JSON in an easy-to-read (for human readers) format? I'm looking primarily for indentation and whitespace, with perhaps even colors / font-styles / etc.

Pretty-printing is implemented natively in JSON.stringify(). The third argument enables pretty printing and sets the spacing to use:
var str = JSON.stringify(obj, null, 2); // spacing level = 2
If you need syntax highlighting, you might use some regex magic like so:
function syntaxHighlight(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, 2);
}
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}
See in action here: jsfiddle
Or a full snippet provided below:
function output(inp) {
document.body.appendChild(document.createElement('pre')).innerHTML = inp;
}
function syntaxHighlight(json) {
json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var cls = 'number';
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = 'key';
} else {
cls = 'string';
}
} else if (/true|false/.test(match)) {
cls = 'boolean';
} else if (/null/.test(match)) {
cls = 'null';
}
return '<span class="' + cls + '">' + match + '</span>';
});
}
var obj = {a:1, 'b':'foo', c:[false,'false',null, 'null', {d:{e:1.3e5,f:'1.3e5'}}]};
var str = JSON.stringify(obj, undefined, 4);
output(str);
output(syntaxHighlight(str));
pre {outline: 1px solid #ccc; padding: 5px; margin: 5px; }
.string { color: green; }
.number { color: darkorange; }
.boolean { color: blue; }
.null { color: magenta; }
.key { color: red; }

User Pumbaa80's answer is great if you have an object you want pretty printed. If you're starting from a valid JSON string that you want to pretty printed, you need to convert it to an object first:
var jsonString = '{"some":"json"}';
var jsonPretty = JSON.stringify(JSON.parse(jsonString),null,2);
This builds a JSON object from the string, and then converts it back to a string using JSON stringify's pretty print.

Better way.
Prettify JSON Array in Javascript
JSON.stringify(jsonobj,null,'\t')

var jsonObj = {"streetLabel": "Avenue Anatole France", "city": "Paris 07", "postalCode": "75007", "countryCode": "FRA", "countryLabel": "France" };
document.getElementById("result-before").innerHTML = JSON.stringify(jsonObj);
In case of displaying in HTML, you should to add a balise <pre></pre>
document.getElementById("result-after").innerHTML = "<pre>"+JSON.stringify(jsonObj,undefined, 2) +"</pre>"
Example:
var jsonObj = {"streetLabel": "Avenue Anatole France", "city": "Paris 07", "postalCode": "75007", "countryCode": "FRA", "countryLabel": "France" };
document.getElementById("result-before").innerHTML = JSON.stringify(jsonObj);
document.getElementById("result-after").innerHTML = "<pre>"+JSON.stringify(jsonObj,undefined, 2) +"</pre>"
div { float:left; clear:both; margin: 1em 0; }
<div id="result-before"></div>
<div id="result-after"></div>

Based on Pumbaa80's answer I have modified the code to use the console.log colours (working on Chrome for sure) and not HTML. Output can be seen inside console. You can edit the _variables inside the function adding some more styling.
function JSONstringify(json) {
if (typeof json != 'string') {
json = JSON.stringify(json, undefined, '\t');
}
var
arr = [],
_string = 'color:green',
_number = 'color:darkorange',
_boolean = 'color:blue',
_null = 'color:magenta',
_key = 'color:red';
json = json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var style = _number;
if (/^"/.test(match)) {
if (/:$/.test(match)) {
style = _key;
} else {
style = _string;
}
} else if (/true|false/.test(match)) {
style = _boolean;
} else if (/null/.test(match)) {
style = _null;
}
arr.push(style);
arr.push('');
return '%c' + match + '%c';
});
arr.unshift(json);
console.log.apply(console, arr);
}
Here is a bookmarklet you can use:
javascript:function JSONstringify(json) {if (typeof json != 'string') {json = JSON.stringify(json, undefined, '\t');}var arr = [],_string = 'color:green',_number = 'color:darkorange',_boolean = 'color:blue',_null = 'color:magenta',_key = 'color:red';json = json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {var style = _number;if (/^"/.test(match)) {if (/:$/.test(match)) {style = _key;} else {style = _string;}} else if (/true|false/.test(match)) {style = _boolean;} else if (/null/.test(match)) {style = _null;}arr.push(style);arr.push('');return '%c' + match + '%c';});arr.unshift(json);console.log.apply(console, arr);};void(0);
Usage:
var obj = {a:1, 'b':'foo', c:[false,null, {d:{e:1.3e5}}]};
JSONstringify(obj);
Edit: I just tried to escape the % symbol with this line, after the variables declaration:
json = json.replace(/%/g, '%%');
But I find out that Chrome is not supporting % escaping in the console. Strange... Maybe this will work in the future.
Cheers!

I think you're looking for something like this :
JSON.stringify(obj, null, '\t');
This "pretty-prints" your JSON string, using a tab for indentation.
If you prefer to use spaces instead of tabs, you could also use a number for the number of spaces you'd like :
JSON.stringify(obj, null, 2);

You can use console.dir(), which is a shortcut for console.log(util.inspect()).
(The only difference is that it bypasses any custom inspect() function defined on an object.)
It uses syntax-highlighting, smart indentation, removes quotes from keys and just makes the output as pretty as it gets.
const object = JSON.parse(jsonString)
console.dir(object, {depth: null, colors: true})
and for the command line:
cat package.json | node -e "process.stdin.pipe(new stream.Writable({write: chunk => console.dir(JSON.parse(chunk), {depth: null, colors: true})}))"

I use the JSONView Chrome extension (it is as pretty as it gets :):
Edit: added jsonreport.js
I've also released an online stand-alone JSON pretty print viewer, jsonreport.js, that provides a human readable HTML5 report you can use to view any JSON data.
You can read more about the format in New JavaScript HTML5 Report Format.

If you are using ES5, simply call JSON.stringify with:
2nd arg: replacer; set to null,
3rd arg: space; use tab.
JSON.stringify(anObject, null, '\t');
Source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Here's user123444555621's awesome HTML one adapted for terminals. Handy for debugging Node scripts:
function prettyJ(json) {
if (typeof json !== 'string') {
json = JSON.stringify(json, undefined, 2);
}
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
function (match) {
let cls = "\x1b[36m";
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = "\x1b[34m";
} else {
cls = "\x1b[32m";
}
} else if (/true|false/.test(match)) {
cls = "\x1b[35m";
} else if (/null/.test(match)) {
cls = "\x1b[31m";
}
return cls + match + "\x1b[0m";
}
);
}
Usage:
// thing = any json OR string of json
prettyJ(thing);

For debugging purpose I use:
console.debug("%o", data);
https://getfirebug.com/wiki/index.php/Console_API
https://developer.mozilla.org/en-US/docs/DOM/console

You can use JSON.stringify(your object, null, 2)
The second parameter can be used as a replacer function which takes key and Val as parameters.This can be used in case you want to modify something within your JSON object.
more reference : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify

Unsatisfied with other pretty printers for Ruby, I wrote my own (NeatJSON) and then ported it to JavaScript including a free online formatter. The code is free under MIT license (quite permissive).
Features (all optional):
Set a line width and wrap in a way that keeps objects and arrays on the same line when they fit, wrapping one value per line when they don't.
Sort object keys if you like.
Align object keys (line up the colons).
Format floating point numbers to specific number of decimals, without messing up the integers.
'Short' wrapping mode puts opening and closing brackets/braces on the same line as values, providing a format that some prefer.
Granular control over spacing for arrays and objects, between brackets, before/after colons and commas.
Function is made available to both web browsers and Node.js.
I'll copy the source code here so that this is not just a link to a library, but I encourage you to go to the GitHub project page, as that will be kept up-to-date and the code below will not.
(function(exports){
exports.neatJSON = neatJSON;
function neatJSON(value,opts){
opts = opts || {}
if (!('wrap' in opts)) opts.wrap = 80;
if (opts.wrap==true) opts.wrap = -1;
if (!('indent' in opts)) opts.indent = ' ';
if (!('arrayPadding' in opts)) opts.arrayPadding = ('padding' in opts) ? opts.padding : 0;
if (!('objectPadding' in opts)) opts.objectPadding = ('padding' in opts) ? opts.padding : 0;
if (!('afterComma' in opts)) opts.afterComma = ('aroundComma' in opts) ? opts.aroundComma : 0;
if (!('beforeComma' in opts)) opts.beforeComma = ('aroundComma' in opts) ? opts.aroundComma : 0;
if (!('afterColon' in opts)) opts.afterColon = ('aroundColon' in opts) ? opts.aroundColon : 0;
if (!('beforeColon' in opts)) opts.beforeColon = ('aroundColon' in opts) ? opts.aroundColon : 0;
var apad = repeat(' ',opts.arrayPadding),
opad = repeat(' ',opts.objectPadding),
comma = repeat(' ',opts.beforeComma)+','+repeat(' ',opts.afterComma),
colon = repeat(' ',opts.beforeColon)+':'+repeat(' ',opts.afterColon);
return build(value,'');
function build(o,indent){
if (o===null || o===undefined) return indent+'null';
else{
switch(o.constructor){
case Number:
var isFloat = (o === +o && o !== (o|0));
return indent + ((isFloat && ('decimals' in opts)) ? o.toFixed(opts.decimals) : (o+''));
case Array:
var pieces = o.map(function(v){ return build(v,'') });
var oneLine = indent+'['+apad+pieces.join(comma)+apad+']';
if (opts.wrap===false || oneLine.length<=opts.wrap) return oneLine;
if (opts.short){
var indent2 = indent+' '+apad;
pieces = o.map(function(v){ return build(v,indent2) });
pieces[0] = pieces[0].replace(indent2,indent+'['+apad);
pieces[pieces.length-1] = pieces[pieces.length-1]+apad+']';
return pieces.join(',\n');
}else{
var indent2 = indent+opts.indent;
return indent+'[\n'+o.map(function(v){ return build(v,indent2) }).join(',\n')+'\n'+indent+']';
}
case Object:
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [JSON.stringify(k), build(o[k],'')];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
keyvals = keyvals.map(function(kv){ return kv.join(colon) }).join(comma);
var oneLine = indent+"{"+opad+keyvals+opad+"}";
if (opts.wrap===false || oneLine.length<opts.wrap) return oneLine;
if (opts.short){
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [indent+' '+opad+JSON.stringify(k),o[k]];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
keyvals[0][0] = keyvals[0][0].replace(indent+' ',indent+'{');
if (opts.aligned){
var longest = 0;
for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
var padding = repeat(' ',longest);
for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
}
for (var i=keyvals.length;i--;){
var k=keyvals[i][0], v=keyvals[i][1];
var indent2 = repeat(' ',(k+colon).length);
var oneLine = k+colon+build(v,'');
keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
}
return keyvals.join(',\n') + opad + '}';
}else{
var keyvals=[],i=0;
for (var k in o) keyvals[i++] = [indent+opts.indent+JSON.stringify(k),o[k]];
if (opts.sorted) keyvals = keyvals.sort(function(kv1,kv2){ kv1=kv1[0]; kv2=kv2[0]; return kv1<kv2?-1:kv1>kv2?1:0 });
if (opts.aligned){
var longest = 0;
for (var i=keyvals.length;i--;) if (keyvals[i][0].length>longest) longest = keyvals[i][0].length;
var padding = repeat(' ',longest);
for (var i=keyvals.length;i--;) keyvals[i][0] = padRight(padding,keyvals[i][0]);
}
var indent2 = indent+opts.indent;
for (var i=keyvals.length;i--;){
var k=keyvals[i][0], v=keyvals[i][1];
var oneLine = k+colon+build(v,'');
keyvals[i] = (opts.wrap===false || oneLine.length<=opts.wrap || !v || typeof v!="object") ? oneLine : (k+colon+build(v,indent2).replace(/^\s+/,''));
}
return indent+'{\n'+keyvals.join(',\n')+'\n'+indent+'}'
}
default:
return indent+JSON.stringify(o);
}
}
}
function repeat(str,times){ // http://stackoverflow.com/a/17800645/405017
var result = '';
while(true){
if (times & 1) result += str;
times >>= 1;
if (times) str += str;
else break;
}
return result;
}
function padRight(pad, str){
return (str + pad).substring(0, pad.length);
}
}
neatJSON.version = "0.5";
})(typeof exports === 'undefined' ? this : exports);

Thanks a lot #all!
Based on the previous answers, here is another variant method providing custom replacement rules as parameter:
renderJSON : function(json, rr, code, pre){
if (typeof json !== 'string') {
json = JSON.stringify(json, undefined, '\t');
}
var rules = {
def : 'color:black;',
defKey : function(match){
return '<strong>' + match + '</strong>';
},
types : [
{
name : 'True',
regex : /true/,
type : 'boolean',
style : 'color:lightgreen;'
},
{
name : 'False',
regex : /false/,
type : 'boolean',
style : 'color:lightred;'
},
{
name : 'Unicode',
regex : /"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?/,
type : 'string',
style : 'color:green;'
},
{
name : 'Null',
regex : /null/,
type : 'nil',
style : 'color:magenta;'
},
{
name : 'Number',
regex : /-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/,
type : 'number',
style : 'color:darkorange;'
},
{
name : 'Whitespace',
regex : /\s+/,
type : 'whitespace',
style : function(match){
return '&nbsp';
}
}
],
keys : [
{
name : 'Testkey',
regex : /("testkey")/,
type : 'key',
style : function(match){
return '<h1>' + match + '</h1>';
}
}
],
punctuation : {
name : 'Punctuation',
regex : /([\,\.\}\{\[\]])/,
type : 'punctuation',
style : function(match){
return '<p>________</p>';
}
}
};
if('undefined' !== typeof jQuery){
rules = $.extend(rules, ('object' === typeof rr) ? rr : {});
}else{
for(var k in rr ){
rules[k] = rr[k];
}
}
var str = json.replace(/([\,\.\}\{\[\]]|"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
var i = 0, p;
if (rules.punctuation.regex.test(match)) {
if('string' === typeof rules.punctuation.style){
return '<span style="'+ rules.punctuation.style + '">' + match + '</span>';
}else if('function' === typeof rules.punctuation.style){
return rules.punctuation.style(match);
} else{
return match;
}
}
if (/^"/.test(match)) {
if (/:$/.test(match)) {
for(i=0;i<rules.keys.length;i++){
p = rules.keys[i];
if (p.regex.test(match)) {
if('string' === typeof p.style){
return '<span style="'+ p.style + '">' + match + '</span>';
}else if('function' === typeof p.style){
return p.style(match);
} else{
return match;
}
}
}
return ('function'===typeof rules.defKey) ? rules.defKey(match) : '<span style="'+ rules.defKey + '">' + match + '</span>';
} else {
return ('function'===typeof rules.def) ? rules.def(match) : '<span style="'+ rules.def + '">' + match + '</span>';
}
} else {
for(i=0;i<rules.types.length;i++){
p = rules.types[i];
if (p.regex.test(match)) {
if('string' === typeof p.style){
return '<span style="'+ p.style + '">' + match + '</span>';
}else if('function' === typeof p.style){
return p.style(match);
} else{
return match;
}
}
}
}
});
if(true === pre)str = '<pre>' + str + '</pre>';
if(true === code)str = '<code>' + str + '</code>';
return str;
}

It works well:
console.table()
Read more here: https://developer.mozilla.org/pt-BR/docs/Web/API/Console/table

Here is a simple JSON format/color component written in React:
const HighlightedJSON = ({ json }: Object) => {
const highlightedJSON = jsonObj =>
Object.keys(jsonObj).map(key => {
const value = jsonObj[key];
let valueType = typeof value;
const isSimpleValue =
["string", "number", "boolean"].includes(valueType) || !value;
if (isSimpleValue && valueType === "object") {
valueType = "null";
}
return (
<div key={key} className="line">
<span className="key">{key}:</span>
{isSimpleValue ? (
<span className={valueType}>{`${value}`}</span>
) : (
highlightedJSON(value)
)}
</div>
);
});
return <div className="json">{highlightedJSON(json)}</div>;
};
See it working in this CodePen:
https://codepen.io/benshope/pen/BxVpjo
Hope that helps!

Couldn't find any solution that had good syntax highlighting for the console, so here's my 2p
Install & Add cli-highlight dependency
npm install cli-highlight --save
Define logjson globally
const highlight = require('cli-highlight').highlight
console.logjson = (obj) => console.log(
highlight( JSON.stringify(obj, null, 4),
{ language: 'json', ignoreIllegals: true } ));
Use
console.logjson({foo: "bar", someArray: ["string1", "string2"]});

I'd like to show my jsonAnalyze method here, it does a pretty print of the JSON structure only, but in some cases can be more usefull that printing the whole JSON.
Say you have a complex JSON like this:
let theJson = {
'username': 'elen',
'email': 'elen#test.com',
'state': 'married',
'profiles': [
{'name': 'elenLove', 'job': 'actor' },
{'name': 'elenDoe', 'job': 'spy'}
],
'hobbies': ['run', 'movies'],
'status': {
'home': {
'ownsHome': true,
'addresses': [
{'town': 'Mexico', 'address': '123 mexicoStr'},
{'town': 'Atlanta', 'address': '4B atlanta 45-48'},
]
},
'car': {
'ownsCar': true,
'cars': [
{'brand': 'Nissan', 'plate': 'TOKY-114', 'prevOwnersIDs': ['4532354531', '3454655344', '5566753422']},
{'brand': 'Benz', 'plate': 'ELEN-1225', 'prevOwnersIDs': ['4531124531', '97864655344', '887666753422']}
]
}
},
'active': true,
'employed': false,
};
Then the method will return the structure like this:
username
email
state
profiles[]
profiles[].name
profiles[].job
hobbies[]
status{}
status{}.home{}
status{}.home{}.ownsHome
status{}.home{}.addresses[]
status{}.home{}.addresses[].town
status{}.home{}.addresses[].address
status{}.car{}
status{}.car{}.ownsCar
status{}.car{}.cars[]
status{}.car{}.cars[].brand
status{}.car{}.cars[].plate
status{}.car{}.cars[].prevOwnersIDs[]
active
employed
So this is the jsonAnalyze() code:
function jsonAnalyze(obj) {
let arr = [];
analyzeJson(obj, null, arr);
return logBeautifiedDotNotation(arr);
function analyzeJson(obj, parentStr, outArr) {
let opt;
if (!outArr) {
return "no output array given"
}
for (let prop in obj) {
opt = parentStr ? parentStr + '.' + prop : prop;
if (Array.isArray(obj[prop]) && obj[prop] !== null) {
let arr = obj[prop];
if ((Array.isArray(arr[0]) || typeof arr[0] == "object") && arr[0] != null) {
outArr.push(opt + '[]');
analyzeJson(arr[0], opt + '[]', outArr);
} else {
outArr.push(opt + '[]');
}
} else if (typeof obj[prop] == "object" && obj[prop] !== null) {
outArr.push(opt + '{}');
analyzeJson(obj[prop], opt + '{}', outArr);
} else {
if (obj.hasOwnProperty(prop) && typeof obj[prop] != 'function') {
outArr.push(opt);
}
}
}
}
function logBeautifiedDotNotation(arr) {
retStr = '';
arr.map(function (item) {
let dotsAmount = item.split(".").length - 1;
let dotsString = Array(dotsAmount + 1).join(' ');
retStr += dotsString + item + '\n';
console.log(dotsString + item)
});
return retStr;
}
}
jsonAnalyze(theJson);

Douglas Crockford's JSON in JavaScript library will pretty print JSON via the stringify method.
You may also find the answers to this older question useful: How can I pretty-print JSON in (unix) shell script?

I ran into an issue today with #Pumbaa80's code. I'm trying to apply JSON syntax highlighting to data that I'm rendering in a Mithril view, so I need to create DOM nodes for everything in the JSON.stringify output.
I split the really long regex into its component parts as well.
render_json = (data) ->
# wraps JSON data in span elements so that syntax highlighting may be
# applied. Should be placed in a `whitespace: pre` context
if typeof(data) isnt 'string'
data = JSON.stringify(data, undefined, 2)
unicode = /"(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?/
keyword = /\b(true|false|null)\b/
whitespace = /\s+/
punctuation = /[,.}{\[\]]/
number = /-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/
syntax = '(' + [unicode, keyword, whitespace,
punctuation, number].map((r) -> r.source).join('|') + ')'
parser = new RegExp(syntax, 'g')
nodes = data.match(parser) ? []
select_class = (node) ->
if punctuation.test(node)
return 'punctuation'
if /^\s+$/.test(node)
return 'whitespace'
if /^\"/.test(node)
if /:$/.test(node)
return 'key'
return 'string'
if /true|false/.test(node)
return 'boolean'
if /null/.test(node)
return 'null'
return 'number'
return nodes.map (node) ->
cls = select_class(node)
return Mithril('span', {class: cls}, node)
Code in context on Github here

If you're looking for a nice library to prettify json on a web page...
Prism.js is pretty good.
http://prismjs.com/
I found using JSON.stringify(obj, undefined, 2) to get the indentation, and then using prism to add a theme was a good approach.
If you're loading in JSON via an ajax call, then you can run one of Prism's utility methods to prettify
For example:
Prism.highlightAll()

Quick pretty human-readable JSON output in 1 line code (without colors):
document.documentElement.innerHTML='<pre>'+JSON.stringify(obj, null, 2)+'</pre>';

If you need this to work in a textarea the accepted solution will not work.
<textarea id='textarea'></textarea>
$("#textarea").append(formatJSON(JSON.stringify(jsonobject),true));
function formatJSON(json,textarea) {
var nl;
if(textarea) {
nl = "
";
} else {
nl = "<br>";
}
var tab = "    ";
var ret = "";
var numquotes = 0;
var betweenquotes = false;
var firstquote = false;
for (var i = 0; i < json.length; i++) {
var c = json[i];
if(c == '"') {
numquotes ++;
if((numquotes + 2) % 2 == 1) {
betweenquotes = true;
} else {
betweenquotes = false;
}
if((numquotes + 3) % 4 == 0) {
firstquote = true;
} else {
firstquote = false;
}
}
if(c == '[' && !betweenquotes) {
ret += c;
ret += nl;
continue;
}
if(c == '{' && !betweenquotes) {
ret += tab;
ret += c;
ret += nl;
continue;
}
if(c == '"' && firstquote) {
ret += tab + tab;
ret += c;
continue;
} else if (c == '"' && !firstquote) {
ret += c;
continue;
}
if(c == ',' && !betweenquotes) {
ret += c;
ret += nl;
continue;
}
if(c == '}' && !betweenquotes) {
ret += nl;
ret += tab;
ret += c;
continue;
}
if(c == ']' && !betweenquotes) {
ret += nl;
ret += c;
continue;
}
ret += c;
} // i loop
return ret;
}

This is nice:
https://github.com/mafintosh/json-markup from mafintosh
const jsonMarkup = require('json-markup')
const html = jsonMarkup({hello:'world'})
document.querySelector('#myElem').innerHTML = html
HTML
<link ref="stylesheet" href="style.css">
<div id="myElem></div>
Example stylesheet can be found here
https://raw.githubusercontent.com/mafintosh/json-markup/master/style.css

To highlight and beautify it in HTML using Bootstrap:
function prettifyJson(json, prettify) {
if (typeof json !== 'string') {
if (prettify) {
json = JSON.stringify(json, undefined, 4);
} else {
json = JSON.stringify(json);
}
}
return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g,
function(match) {
let cls = "<span>";
if (/^"/.test(match)) {
if (/:$/.test(match)) {
cls = "<span class='text-danger'>";
} else {
cls = "<span>";
}
} else if (/true|false/.test(match)) {
cls = "<span class='text-primary'>";
} else if (/null/.test(match)) {
cls = "<span class='text-info'>";
}
return cls + match + "</span>";
}
);
}

based on #user123444555621, just slightly more modern.
const clsMap = [
[/^".*:$/, "key"],
[/^"/, "string"],
[/true|false/, "boolean"],
[/null/, "key"],
[/.*/, "number"],
]
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span class="${clsMap.find(([regex]) => regex.test(match))[1]}">${match}</span>`);
you can also specify the colors inside js (no CSS needed)
const clsMap = [
[/^".*:$/, "red"],
[/^"/, "green"],
[/true|false/, "blue"],
[/null/, "magenta"],
[/.*/, "darkorange"],
]
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span style="color:${clsMap.find(([regex]) => regex.test(match))[1]}">${match}</span>`);
and a version with less regex
const clsMap = [
[match => match.startsWith('"') && match.endsWith(':'), "red"],
[match => match.startsWith('"'), "green"],
[match => match === "true" || match === "false" , "blue"],
[match => match === "null", "magenta"],
[() => true, "darkorange"],
];
const syntaxHighlight = obj => JSON.stringify(obj, null, 4)
.replace(/&/g, '&')
.replace(/</g, '<')
.replace(/>/g, '>')
.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, match => `<span style="color:${clsMap.find(([fn]) => fn(match))[1]}">${match}</span>`);

it's for Laravel, Codeigniter
Html:
<pre class="jsonPre"> </pre>
Controller: Return the JSON value from the controller as like as
return json_encode($data, JSON_PRETTY_PRINT);
In script:
<script> $('.jsonPre').html(result); </script>
result will be

Here is how you can print without using native function.
function pretty(ob, lvl = 0) {
let temp = [];
if(typeof ob === "object"){
for(let x in ob) {
if(ob.hasOwnProperty(x)) {
temp.push( getTabs(lvl+1) + x + ":" + pretty(ob[x], lvl+1) );
}
}
return "{\n"+ temp.join(",\n") +"\n" + getTabs(lvl) + "}";
}
else {
return ob;
}
}
function getTabs(n) {
let c = 0, res = "";
while(c++ < n)
res+="\t";
return res;
}
let obj = {a: {b: 2}, x: {y: 3}};
console.log(pretty(obj));
/*
{
a: {
b: 2
},
x: {
y: 3
}
}
*/

The simplest way to display an object for debugging purposes:
console.log("data",data) // lets you unfold the object manually
If you want to display the object in the DOM, you should consider that it could contain strings that would be interpreted as HTML. Therefore, you need to do some escaping...
var s = JSON.stringify(data,null,2) // format
var e = new Option(s).innerHTML // escape
document.body.insertAdjacentHTML('beforeend','<pre>'+e+'</pre>') // display

<!-- here is a complete example pretty print with more space between lines-->
<!-- be sure to pass a json string not a json object -->
<!-- use line-height to increase or decrease spacing between json lines -->
<style type="text/css">
.preJsonTxt{
font-size: 18px;
text-overflow: ellipsis;
overflow: hidden;
line-height: 200%;
}
.boxedIn{
border: 1px solid black;
margin: 20px;
padding: 20px;
}
</style>
<div class="boxedIn">
<h3>Configuration Parameters</h3>
<pre id="jsonCfgParams" class="preJsonTxt">{{ cfgParams }}</pre>
</div>
<script language="JavaScript">
$( document ).ready(function()
{
$(formatJson);
<!-- this will do a pretty print on the json cfg params -->
function formatJson() {
var element = $("#jsonCfgParams");
var obj = JSON.parse(element.text());
element.html(JSON.stringify(obj, undefined, 2));
}
});
</script>

JavaScript function to convert JSON key-value object to query string

I'm working on formatting a URL for the Facebook Feed Dialog. There's so many parameters though. I want to have a function for these dialogs, something like:
function generateDialogUrl(dialog, params) {
base = "http://www.facebook.com/dialog/" + dialog + "?";
tail = [];
for (var p in params) {
if (params.hasOwnProperty(p)) {
tail.push(p + "=" + escape(params[p]));
}
}
return base + tail.join("&")
}
Oh wow... I think I just answered my own question. Is that right? Is escape() the correct function to use?
I'm stuck in the Lovers source code.
UPDATE: Since, we're using jQuery, I rewrote the method using jQuery.each. I also replaced escape() with encodeURIComponent() as suggested by #galambalazs & #T.J. Crowder. Thanks, guys!
var generateDialogUrl = function (dialog, params) {
base = "http://www.facebook.com/dialog/" + dialog + "?";
tail = [];
$.each(params, function(key, value) {
tail.push(key + "=" + encodeURIComponent(value));
})
return base + tail.join("&");
}
It's working!

Better yet, use encodeURIComponent instead. See this article comparing the two:
The escape() method does not encode
the + character which is interpreted
as a space on the server side as well
as generated by forms with spaces in
their fields. Due to this shortcoming
and the fact that this function fails
to handle non-ASCII characters
correctly, you should avoid use of
escape() whenever possible. The best
alternative is usually
encodeURIComponent().
escape() will not encode: #*/+

There is a jQuery method to accomplish this: $.param. It would work like this:
var generateDialogUrl = function (dialog, params) {
base = 'http://www.facebook.com/dialog/' + dialog + '?';
return base + $.param(params);
}

const createQueryParams = (param, prefix = '') => {
let queryString = '';
if (param.constructor === Object) {
queryString = Object.keys(param).reduce((result, key) => {
const obj = param[key];
const queryParam = result ? `${result}&${prefix}` : prefix;
if (obj.constructor === Object) {
return `${queryParam}${createQueryParams(obj, `${key}.`)}`;
} else if(obj.constructor === Array) {
const qp= obj.map((item, index)=> {
if (item.constructor === Object || item.constructor === Array) {
const query = createQueryParams(item, `${key}[${index}].`);
return `${query}`;
} else {
return `${key}[${index}]=${item}`;
}
}).reduce((res, cur) => {
return res ? `${res}&${cur}`: `${cur}`;
}, '');
return `${queryParam}${qp}`;
} else {
return `${queryParam}${key}=${obj}`;
}
}, '');
} else if(param.constructor === Array) {
queryString = param.reduce((res, cur) => `${res},${cur}`);
} else {
queryString = param;
}
return encodeURI(queryString);
};
Example:
createQueryParams({"Context":{"countryCode":"NO"},"Pagination":{"limit":10,"offset":1},"AdditionalField":[{"name":"Policy Number","value":"Pol123"},{"name":"Policy Version","value":"PV1"}]});

convertJsonToQueryString: function (json, prefix) {
//convertJsonToQueryString({ Name: 1, Children: [{ Age: 1 }, { Age: 2, Hoobbie: "eat" }], Info: { Age: 1, Height: 80 } })
if (!json) return null;
var str = "";
for (var key in json) {
var val = json[key];
if (isJson(val)) {
str += convertJsonToQueryString(val, ((prefix || key) + "."));
} else if (typeof (val) == "object" && ("length" in val)) {
for (var i = 0; i < val.length; i++) {
//debugger
str += convertJsonToQueryString(val[i], ((prefix || key) + "[" + i + "]."));
}
}
else {
str += "&" + ((prefix || "") + key) + "=" + val;
}
}
return str ? str.substring(1) : str;
}
isJson = function (obj) {
return typeof (obj) == "object" && Object.prototype.toString.call(obj).toLowerCase() == "[object object]" && !obj.length;
};
example:
convertJsonToQueryString({Name:1,Children:[{Age:1},{Age:2,Hoobbie:"eat"}],Info:{Age:1,Height:80}})
Result:
"Name=1Children[0].Age=1Children[1].Age=2&Children[1].Hoobbie=eatInfo.Age=1&Info.Height=80"

Develop Reference

JavaScript is the programming language of the Web.

Is there any native function to convert json to url parameters? - javascript

Using ES6 syntax: var data = { 'action':'actualiza_resultado', 'postID': 1, 'gl': 2, 'gl2' : 3 }; let urlParameters = Object.entries(data).map(e => e.join('=')).join('&'); console.log(urlParameters);

Based on georg's answer, but also adding ? before the string and using ES6: const query = !params ? '': Object.keys(params).map((k, idx) => { let prefix = ''; if (idx === 0) { prefix = '?'; } return prefix + encodeURIComponent(k) + '=' + encodeURIComponent(params[k]); }).join('&');

Related

query string takes off last ')' in url

How to output json prettry formt as html using javascript? [duplicate]

Get the "path" of a JSON object in JavaScript

Making JSON output "pretty" with CSS [duplicate]

JavaScript function to convert JSON key-value object to query string

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