I'm writing a simple JS app that takes in a JSON file, displays the information to the user and allows them to modify it, and then allows them to re-export the JSON. However, the JSON that is being brought in is multi-line; each key/value is on its own line. When I use .stringify to output the JSON, it all appears on one line. Is there any way for the stringify method to separate the lines?
JSON Structure:
{"Title":
{"lvlOne":[
{"key":"val"},
{"key":"val"},
{"key":"val"}
],
"lvl2":[
{"key":"val"},
{"key":"val"},
{"key":"val"}
]}
}
But when I output, it all shows:
{"Title":{"lvlOne":[{"key":"val"},{"key":"val"},{"key":"val"}],"lvl2":[{"key":"val"{"key":"val"},{"key":"val"}]}}
You can use the space parameter of the stringify method. From the official page, here is the relevant excerpt:
JSON.stringify({ a: 2 }, null, " "); // '{\n "a": 2\n}'
you can also use.
var json = JSON.stringify({ uno: 1, dos : {"s":"dd","t":"tt"} }, null, '\t');
console.log(json);
Or even better, the count of spaces in the indentation:
var json = JSON.stringify({ uno: 1, dos : {"s":"dd","t":"tt"} }, null, 2);
None of the above worked for me the only thing that worked for me was
await fs.promises.writeFile('testdataattr.json',JSON.stringify(datatofile, null,'\r\n'),'utf8') ;
Related
I have data structure as below
{
status: false,
executed: true,
output : "Service is under maintenance [ {"command" :"uptime", "output" :"connection timeout"}] - exit status 3
}
I am trying to extract [ { "command" :"uptime", "output" :"connection timeout" }] from above data structure. if it is clean it be using regular dot walking with parse.
As this is not in proper format, I am looking for suggestions only to extract valid data structure.
Any suggestions greatly appreciated.
Thank you.
use indexOf("[") and lastIndexOf("]") to substring the string then use JSON.parse to parse the jsonstring ,then you will get [ { "command" :"uptime", "output" :"connection timeout" }];
hope it would help you
You can use string split functions in JavaScript to split the output string and then Parse the JSON String as a valid JSON. Hope the below code will help you.
var inputJson ={
status: false,
executed: true,
output : 'Service is under maintenance [ {"command" :"uptime", "output" :"connection timeout"}] - exit status 3'
}
var outputJson = JSON.parse(inputJson.output.split("[")[1].split("]")[0]);
console.log(outputJson.output);
Assuming output is a string from Service to status 3...
Here is a function to "clean" your data. I added a condition in case the data isn't "messed" ;)
let messedData = {
status: false,
executed: true,
output: 'Service is under maintenance[{"command": "uptime","output": "connection timeout"}] - exit status 3 '
}
function clean(data){
if(typeof(data.output) === "string"){
data.output = JSON.parse(data.output.match(/\[.+\]/)[0])
}
return data
}
console.log(clean(messedData))
I have a situation where a user can upload a csv file. This CSV file contains a lot of data, but I am only interested in 2 columns (ID and Date). At the moment, I am parsing the CSV using Papaparse
Papa.parse(ev.data, {
delimiter: "",
newline: "",
quoteChar: '"',
header: true,
error: function(err, file, inputElem, reason) { },
complete: function (results) {
this.parsed_csv = results.data;
}
});
When this is run this.parsed_csv represents objects of data keyed by the field name. So if I JSON.stringify the output is something like this
[
{
"ID": 123456,
"Date": "2012-01-01",
"Irrelevant_Column_1": 123,
"Irrelevant_Column_2": 234,
"Irrelevant_Column_3": 345,
"Irrelevant_Column_4": 456
},
...
]
So my main question is how can I get rid of the columns I dont need, and just produce a new csv containing the columns ID and Date?
Thanks
One thing I realised, is there a way to add dynamic variables. For instance I am letting users select the columns I want to map. Now I need to do something like this
let ID = this.selectedIdCol;
this.parsed_csv = results.data.map(element => ({ID: element.ID, Date: element.Date}));
It is saying that ID is unused however. Thanks
let data = [
{
"ID": 123456,
"Date": "2012-01-01",
"Irrelevant_Column_1": 123,
"Irrelevant_Column_2": 234,
"Irrelevant_Column_3": 345,
"Irrelevant_Column_4": 456
},
...
]
just produce results by using the following code:
data = data.map(element => ({ID: element.ID, Date: element.Date}))
Now you have desired column, please generate a new CSV on these columns
As Serrurier pointed out above, You should use the step/chunk function to alter the data rather than after parse map as in memory data is already available.
PapaParse.parse(file, { skipEmptyLines: true, header: true, step: (results, parser) => {
results.data = _.pick(results.data , [ 'column1' 'column2']);
return results;
}});
Note that if you are loading a huge file, you will have the whole file in memory right after the parsing. Moreover it may freeze the browser due to the heavy workload. You can avoid that by reading and discarding columns :
row by row
chunk by chunk.
You should read Papaparse's FAQ before implementing that. To sum up, you will store required columns by extracting them from the step or chunk callbacks.
I am beginner in Javascript/jQuery and I am working on an interface made with KnockoutJS, so I have several models. I would like to save all the data in the database but I don't know how to do it.
I started with :
self.save = function() {
var data = ko.toJS(self);
var test = ko.toJSON(self);
console.log(test);
}
$.ajax({
url: "myURL",
data: {'carrier': data.carrier},
type: "POST",
});
and this is the result of the console.log :
{"id":1,"carrier":"1","Settings":[{"id":1,"price":{"id":1,"DeliveryStandard":"3.00","DeliveryExpress":"6.00","Details":{"id":1,"Standard":[{"id":1,"fromPrice":0,"maxPrice":"45.000"}],"Express"[{"id":1,"fromPrice":0,"maxPrice":"66.000"}]}}}}]}
I can get the value of carrier by using data.carrier but I don't know how to get the other data like DeiveryStandard, DeliveryExpress, fromPrice, maxPrice ...
Have you got an idea?
Thanks you in advance, and sorry if my question is silly!
If you format your JSON into a more readable format, with indenting, it makes it a lot easier to understand:
(though it should be noted that it is only technically JSON while in a string format, outside of that it is just a standard javascript object)
{
"id":1,
"carrier":"1",
"Settings":[
{
"id":1,
"price": { "id":1,
"DeliveryStandard":"3.00",
"DeliveryExpress":"6.00",
"Details": { "id":1,
"Standard": [{"id":1,
"fromPrice":0,
"maxPrice":"45.000"
}],
"Express" //Missing semi-colon
[{"id":1,
"fromPrice":0,
"maxPrice":"66.000"
}]
}
}
}}//One too many closing braces
]
}
First thing to note is you have 2 syntax errors, highlighted above with comments. So fix them first! (Though I wonder if they are typos as you seem to have it working at your end)
Then we can look at the structure tree to work out where the values you want are...
DeiveryStandard and DeliveryExpress are both properties of an object assigned to price, which it a property of the first item in the Settings array. So you can access them like so:
var DeliveryStandard = data.Settings[0].price.DeliveryStandard;
var DeliveryExpress= data.Settings[0].price.DeliveryExpress;
fromPrice and maxPrice are found multiple times, in both Standard and Express items. So you need to decide what version you need. If you want Standard then you can get the first item of the Standard array like so:
var standardObject = data.Settings[0].price.Details.Standard[0];
Which you can then access the properties of like:
var fromPrice = standardObject.fromPrice;
var maxPrice = standardObject.maxPrice;
I am sure you can work out how to get the Express version of the same data!
From what you seem to have been able to work out on your own, I think your problem is not knowing how to deal with the arrays. Note that arrays are defined with square brackets [], and elements within an array should be accessed with a zero-based index, for example: array[0] for the first element, and array[1] for the second element.
This should work.
console.log(data.Settings[0].price.DeliveryStandard);
Fixed some errors in your JSON.
var j = {
"id" : 1,
"carrier" : "1",
"Settings" : [{
"id" : 1,
"price" : {
"id" : 1,
"DeliveryStandard" : "3.00",
"DeliveryExpress" : "6.00",
"Details" : {
"id" : 1,
"Standard" : [
{
"id" : 1,
"fromPrice" : 0,
"maxPrice" : "45.000"
}
],
"Express": [
{
"id" : 1,
"fromPrice" : 0,
"maxPrice" : "66.000"
}
]
}
}
}
]
};
alert(j.Settings[0].price.DeliveryStandard);
alert(j.Settings[0].price.DeliveryExpress);
alert(j.Settings[0].price.Details.Standard[0].fromPrice);
alert(j.Settings[0].price.Details.Standard[0].maxPrice);
I'm unable to successfully get data from the JSON string below. Using JavaScript, I'm able to alert the full string [ alert(data); ] but I'm unable to get only the first name.
Can someone please help?
var data = {
"name": [
"Enid Norgard",
"Cassie Durrett",
"Josephine Ervin"
],
"email": [
"TheWoozyGamer#gmail.com",
"TheHabitualGamer#gmail.com",
"TheUptightGamer#gmail.com"
],
"role": [
"Gamer",
"Team Leader",
"Player"
],
"emp_id": [
"50",
"408",
"520"
],
"id": [
"234",
"444",
"235"
]
}
Looks like you have a string(because when you use alert the complete text is shown, if it was a object then [Object object] would have shown), first you need to parse it using JSON.parse()
var t = JSON.parse(data)
alert(t.name[0])
Note: Old browsers like IE8 which does not have native support for JSON you have to add a library like json2 to add JSON support
use the following code
alert(data.name[0]);
//sample code
var json = '{"result":true,"count":1}',
obj = JSON.parse(json);
alert(obj.count);
For the browsers that don't you can implement it using json2.js.
Most browsers support JSON.parse(), hope this will help you for detail see link.
With data.name[0] you will get the name Enid Norgard
Similar to that use
data.name[index]
while index is the position of the name in the innerarray.
If you want only the names array use:
alert(data.name)
try this to loop through all elements
for(x in data)
{
for(y in data[x])
{
alert(data[x][y]);
}
}
I am using the auto complete plugin by Devbridge and I have it all installed here is my code:
$(document).ready(function(){
$('#request_task').autocomplete({
serviceUrl: '<%= ajax_path %>',
minChars:1,
width: 300,
delimiter: /(,|;)\s*/,
deferRequestBy: 0, //miliseconds
params: { artists: 'Yes' },
});
});
This request hits my rails action and returns this json. there is only one object returned but most of the time there will be more then 1...this was just a test case:
[
{
"user": {
"salt": "somthing",
"name": "john",
"encrypted_password": "92dadsfa6b001ffe71c3c1d8e9fb76c42d1c8afeffa739de9063d94206c",
"created_at": "2010-09-10T14:10:54Z",
"updated_at": "2010-09-10T14:10:54Z",
"admin": null,
"id": 1,
"remember_token": "c945522b3eb0a25e36bb39155fc05b3eec301ac5e2196956f2e6f86b4b22c987",
"email": "test#gmail.com"
}
}
]
I can clearly see the request in firebug but I am not getting anything for the autocomplete and it errors out...Am i missing anything...My error is
a.suggestions is undefined
I think you need to read a little further down the developers page as your response is in the wrong format:
Web page that provides data for Ajax
Autocomplete, in our case
autocomplete.ashx will receive GET
request with querystring ?query=Li,
and it must return JSON data in the
following format:
{
query:'Li',
suggestions:['Liberia','Libyan Arab Jamahiriya','Liechtenstein','Lithuania'],
data:['LR','LY','LI','LT']
}
Notes:
query - original query value
suggestions - comma separated array of suggested values data
(optional) - data array, that contains values for callback function when data is selected.
Sincere advice , dont construct JSON Strings. Please go for an API.
If you are using java, check this out http://www.json.org/java/
and make sure to set content-type in response as application/json
YOUR JSON is in a wrong format
Check their correct format
{
query:'Li',
suggestions:['Liberia','Libyan Arab Jamahiriya','Liechtenstein','Lithuania'],
data:['LR','LY','LI','LT']
}