Develop Reference

Parse search params in relative URL in Javascript

I have a relative URL, something like /a/b?someParam=cccc
I want to extract the value of the parameter. One alternative is to do (new URL(myUri, 'http://example.com')).searchParams.get('someParam'). It is nice because it uses the built-in functions from the browser and it is going to be safe in cases when the parameter of the url is encoded.
However, it depends on a random base of the url http://example.com. Is there a way to parse a URL without a base? Or to extract the search params?

You could take everything after the ? and pass it directly to URLSearchParams.
const getParamsFromURI = ( uri ) => {
// Get everything after the `?`
const [ , paramString ] = uri.split( '?' );
// Return parameters
return new URLSearchParams( paramString );
};
const params = getParamsFromURI( '/a/b?someParam=cccc' );
console.log( params.get( 'someParam' ) );
Or if you want to use the URL constructor you can get a base from window.location.origin
const getParamsFromURI = ( uri ) => {
// Create url with base
const base = window.location.origin; // Could also be a fixed value e.g. http://example.com
const url = new URL( uri, base );
// Return parameters
return url.searchParams;
};
const params = getParamsFromURI( '/a/b?someParam=cccc' );
console.log( params.get( 'someParam' ) );

Try this:
const paramString = "/a/b?someParam=cccc".split("?")[1];
const params = new URLSearchParams(paramString);
const result = Object.fromEntries(params.entries());
console.log(result);

You could manipulate the string like this
var test = "/a/b?someParam=cccc&someotherparam=bbb";
var params = test.split('?')[1].split('&').map( (e) => {
let temp = e.split('=');
let rObj = {};
rObj[temp[0]] = temp[1];
return rObj;
} );
console.log(params);
At first you split the string to two segments (before and after "?"). Then you split again the second part by the "&" symbol to generate an array of strings.
In the end you map the array to generate an object with keys and values.
I hope the helps.
EDIT
If you want to use the method URLSearchParams you could do it like this
var test = "/a/b?someParam=cccc&someotherparam=bbb";
var params = new URLSearchParams(test.split('?')[1]);
console.log(params.get("someParam"));

var url_string = "/a/b?someParam=cccc";
function getParam( name, url ) {
if (!url) url = location.href;
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regexS = "[\\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var results = regex.exec( url );
return results == null ? null : results[1];
}
console.log(getParam('someParam', url_string))

How to replace this url to my a format id that i want, thanks [duplicate]

This question already has an answer here:
Reference - What does this regex mean?
(1 answer)
Closed 2 years ago.
Is there any way (maybe a regex) to replace the id dynamic to "id"
I use js and typescript
The original url:
localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728
The url i want:
localhost:4200/reservations/id/properties/id

Here's a solution using regex:
function replaceURL(url, data) {
Object.entries(data).forEach(([key, value]) => url = url.replace(new RegExp(`(?<=${key}\\/)\\w+`, 'g'), value));
return url;
}
// the original url
const url = 'localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728';
// put what you want to replace in this object
const data = {
reservations: 'id',
properties: 'id'
};
const result = replaceURL(url, data);
console.log(result);
Edit
I think I overthought the situation, if you just want to replace the text similar to 5eda023aed43c1e46d6ce804, you can just use the following regex:
/(?<=\/)[0-9a-f]{24,}/g
const regex = /(?<=\/)[0-9a-f]{24,}/g;
let url = 'localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728';
let result = url.replace(regex, 'id');
console.log(result);
url = 'http://localhost:4200/minibar/items/5efdcee02c37c160e8a5bbe1';
result = url.replace(regex, 'id');
console.log(result);

You can try this
let url = 'localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728';
let replacedUrl = url.replace(/\/[a-fA-F0-9]{24}/g, "/id");
console.log(replacedUrl);

If your url format is fix then you can use this simple code.
var link=" localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728";
//var link="http://localhost:4200/minibar/items/5efdcee02c37c160e8a5bbe1"
var hasNumber = /\d/;
var linkParts=link.split("/");
var i=link.indexOf("http")==0?3:2;
for(i;i<linkParts.length;i++)
{
if(linkParts[i].length>20 && hasNumber.test(linkParts[i]))
linkParts[i]="id";
}
document.write(linkParts.join("/"));

You can simply replace the exact id with what you want.
let url = 'localhost:4200/reservations/5eda023aed43c1e46d6ce804/properties/5ca199fdda8ba619695b5728';
let id = '5eda023aed43c1e46d6ce804' // the id to replace
let rx = new RegExp(id,"g"); // use "g" to indicate it should should ALL ids in the string
url = url.replace(rx, "id") // this will replace the dynamic id with the word "id"
// localhost:4200/reservations/id/properties/id

Count the number of parameters in query string

How can I count the number of parameters query strings passed? e.g.
www.abc.com/product.html?product=furniture&&images=true&&stocks=yes
I want to be able to get the answer as 3
1. product=furniture
2. images=true
3. stocks=yes
var url = window.location.href;
var arr = url.split('=');
console.log(url.length)

You can use String's match:
var matches = str.match(/[a-z\d]+=[a-z\d]+/gi);
var count = matches? matches.length : 0;

first get the location of a question mark character ? in the required url
var pos = location.href.indexOf("?");
if(pos==-1) return [];
query = location.href.substr(pos+1);
then get the array of parameters:
var result = {};
query.split("&").forEach(function(part) {
var item = part.split("=");
result[item[0]] = decodeURIComponent(item[1]);
});
Then count the length of result as
result.length;

If you're using express you can use
Object.keys(req.query).length
see here: How to get number of request query parameters in express.js?

You could use the search variable in the document.location object to get the search string and then use a match on the '=' symbols to get a count (see example below)
var paramCount = document.location.search.match(/=/g).length;

How about the URLSearchParams interface that provides utility methods to work with the query string of a URL?
Something like that:
var url_string = window.location.href;
var url_var = new URL(url_string);
var params = url_var.searchParams;
var param_count = 0;
for (const [key, value] of params.entries()) {param_count++;}

How to obtain the query string from the current URL with JavaScript?

I have URL like this:
http://localhost/PMApp/temp.htm?ProjectID=462
What I need to do is to get the details after the ? sign (query string) - that is ProjectID=462. How can I get that using JavaScript?
What I've done so far is this:
var url = window.location.toString();
url.match(?);
I don't know what to do next.

Have a look at the MDN article about window.location.
The QueryString is available in window.location.search.
If you want a more convenient interface to work with, you can use the searchParams property of the URL interface, which returns a URLSearchParams object. The returned object has a number of convenient methods, including a get-method. So the equivalent of the above example would be:
let params = (new URL(document.location)).searchParams;
let name = params.get("name");
The URLSearchParams interface can also be used to parse strings in a querystring format, and turn them into a handy URLSearchParams object.
let paramsString = "name=foo&age=1337"
let searchParams = new URLSearchParams(paramsString);
searchParams.has("name") === true; // true
searchParams.get("age") === "1337"; // true
The URLSearchParams interface is now widely adopted in browsers (95%+ according to Can I Use), but if you do need to support legacy browsers as well, you can use a polyfill.

Use window.location.search to get everything after ? including ?
Example:
var url = window.location.search;
url = url.replace("?", ''); // remove the ?
alert(url); //alerts ProjectID=462 is your case

decodeURI(window.location.search)
.replace('?', '')
.split('&')
.map(param => param.split('='))
.reduce((values, [ key, value ]) => {
values[ key ] = value
return values
}, {})

If you happened to use Typescript and have dom in your the lib of tsconfig.json, you can do:
const url: URL = new URL(window.location.href);
const params: URLSearchParams = url.searchParams;
// get target key/value from URLSearchParams object
const yourParamValue: string = params.get('yourParamKey');
// To append, you can also leverage api to avoid the `?` check
params.append('newKey', 'newValue');

You can use this for direct find value via params name.
const urlParams = new URLSearchParams(window.location.search);
const myParam = urlParams.get('myParam');

This will add a global function to access to the queryString variables as a map.
// -------------------------------------------------------------------------------------
// Add function for 'window.location.query( [queryString] )' which returns an object
// of querystring keys and their values. An optional string parameter can be used as
// an alternative to 'window.location.search'.
// -------------------------------------------------------------------------------------
// Add function for 'window.location.query.makeString( object, [addQuestionMark] )'
// which returns a queryString from an object. An optional boolean parameter can be
// used to toggle a leading question mark.
// -------------------------------------------------------------------------------------
if (!window.location.query) {
window.location.query = function (source) {
var map = {};
source = source || this.search;
if ("" != source) {
var groups = source, i;
if (groups.indexOf("?") == 0) {
groups = groups.substr(1);
}
groups = groups.split("&");
for (i in groups) {
source = groups[i].split("=",
// For: xxx=, Prevents: [xxx, ""], Forces: [xxx]
(groups[i].slice(-1) !== "=") + 1
);
// Key
i = decodeURIComponent(source[0]);
// Value
source = source[1];
source = typeof source === "undefined"
? source
: decodeURIComponent(source);
// Save Duplicate Key
if (i in map) {
if (Object.prototype.toString.call(map[i]) !== "[object Array]") {
map[i] = [map[i]];
}
map[i].push(source);
}
// Save New Key
else {
map[i] = source;
}
}
}
return map;
}
window.location.query.makeString = function (source, addQuestionMark) {
var str = "", i, ii, key;
if (typeof source == "boolean") {
addQuestionMark = source;
source = undefined;
}
if (source == undefined) {
str = window.location.search;
}
else {
for (i in source) {
key = "&" + encodeURIComponent(i);
if (Object.prototype.toString.call(source[i]) !== "[object Array]") {
str += key + addUndefindedValue(source[i]);
}
else {
for (ii = 0; ii < source[i].length; ii++) {
str += key + addUndefindedValue(source[i][ii]);
}
}
}
}
return (addQuestionMark === false ? "" : "?") + str.substr(1);
}
function addUndefindedValue(source) {
return typeof source === "undefined"
? ""
: "=" + encodeURIComponent(source);
}
}
Enjoy.

You can simply use URLSearchParams().
Lets see we have a page with url:
https://example.com/?product=1&category=game
On that page, you can get the query string using window.location.search and then extract them with URLSearchParams() class.
const params = new URLSearchParams(window.location.search)
console.log(params.get('product')
// 1
console.log(params.get('category')
// game
Another example using a dynamic url (not from window.location), you can extract the url using URL object.
const url = new URL('https://www.youtube.com/watch?v=6xJ27BtlM0c&ab_channel=FliteTest')
console.log(url.search)
// ?v=6xJ27BtlM0c&ab_channel=FliteTest
This is a simple working snippet:
const urlInput = document.querySelector('input[type=url]')
const keyInput = document.querySelector('input[name=key]')
const button = document.querySelector('button')
const outputDiv = document.querySelector('#output')
button.addEventListener('click', () => {
const url = new URL(urlInput.value)
const params = new URLSearchParams(url.search)
output.innerHTML = params.get(keyInput.value)
})
div {
margin-bottom: 1rem;
}
<div>
<label>URL</label> <br>
<input type="url" value="https://www.youtube.com/watch?v=6xJ27BtlM0c&ab_channel=FliteTest">
</div>
<div>
<label>Params key</label> <br>
<input type="text" name="key" value="v">
</div>
<div>
<button>Get Value</button>
</div>
<div id="output"></div>

You can use this function, for split string from ?id=
function myfunction(myvar){
var urls = myvar;
var myurls = urls.split("?id=");
var mylasturls = myurls[1];
var mynexturls = mylasturls.split("&");
var url = mynexturls[0];
alert(url)
}
myfunction(window.top.location.href);
myfunction("http://www.myname.com/index.html?id=dance&emp;cid=in_social_facebook-hhp-food-moonlight-influencer_s7_20160623");
here is the fiddle

window.location.href.slice(window.location.href.indexOf('?') + 1);

You can use the search property of the window.location object to obtain the query part of the URL. Note that it includes the question mark (?) at the beginning, just in case that affects how you intend to parse it.

You should take a look at the URL API that has helper methods to achieve this in it as the URLSearchParams: https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
This is not currently supported by all modern browsers, so don't forget to polyfill it (Polyfill available using https://qa.polyfill.io/).

var queryObj = {};
if(url.split("?").length>0){
var queryString = url.split("?")[1];
}
now you have the query part in queryString
First replace will remove all the white spaces, second will replace all the '&' part with "," and finally the third replace will put ":" in place of '=' signs.
queryObj = JSON.parse('{"' + queryString.replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g,'":"') + '"}')
So let say you had a query like abc=123&efg=456. Now before parsing, your query is being converted into something like {"abc":"123","efg":"456"}. Now when you will parse this, it will give you your query in json object.

8 years later, for a one-liner
const search = Object.fromEntries(new URLSearchParams(location.search));
Down-side, it does NOT work with IE11
To explain
The URLSearchParams interface defines utility methods to work with the query string of a URL. (From , https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams)
The Object.fromEntries() method transforms a list of key-value pairs into an object. (From, https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries)
// For https://caniuse.com/?search=fromEntries
> Object.fromEntries(new URLSearchParams(location.search))
> {search: "fromEntries"}

Convert that into array then split with '?'
var url= 'http://localhost/PMApp/temp.htm?ProjectID=462';
url.split('?')[1]; //ProjectID=462

q={};location.search.replace(/([^?&=]+)=([^&]+)/g,(_,k,v)=>q[k]=v);q;

Try this one
/**
* Get the value of a querystring
* #param {String} field The field to get the value of
* #param {String} url The URL to get the value from (optional)
* #return {String} The field value
*/
var getQueryString = function ( field, url ) {
var href = url ? url : window.location.href;
var reg = new RegExp( '[?&]' + field + '=([^&#]*)', 'i' );
var string = reg.exec(href);
return string ? string[1] : null;
};
Let’s say your URL is http://example.com&this=chicken&that=sandwich. You want to get the value of this, that, and another.
var thisOne = getQueryString('this'); // returns 'chicken'
var thatOne = getQueryString('that'); // returns 'sandwich'
var anotherOne = getQueryString('another'); // returns null
If you want to use a URL other than the one in the window, you can pass one in as a second argument.
var yetAnotherOne = getQueryString('example', 'http://another-example.com&example=something'); // returns 'something'
Reference

I think it is way more safer to rely on the browser than any ingenious regex:
const parseUrl = function(url) {
const a = document.createElement('a')
a.href = url
return {
protocol: a.protocol ? a.protocol : null,
hostname: a.hostname ? a.hostname : null,
port: a.port ? a.port : null,
path: a.pathname ? a.pathname : null,
query: a.search ? a.search : null,
hash: a.hash ? a.hash : null,
host: a.host ? a.host : null
}
}
console.log( parseUrl(window.location.href) ) //stacksnippet
//to obtain a query
console.log( parseUrl( 'https://example.com?qwery=this').query )

This will return query parameters as an associative array
var queryParams =[];
var query= document.location.search.replace("?",'').split("&");
for(var i =0; i< query.length; i++)
{
if(query[i]){
var temp = query[i].split("=");
queryParams[temp[0]] = temp[1]
}
}

For React Native, React, and For Node project, below one is working
yarn add query-string
import queryString from 'query-string';
const parsed = queryString.parseUrl("https://pokeapi.co/api/v2/pokemon?offset=10&limit=10");
console.log(parsed.offset) will display 10

Get query string parameters url values with jQuery / Javascript (querystring)

Anyone know of a good way to write a jQuery extension to handle query string parameters? I basically want to extend the jQuery magic ($) function so I can do something like this:
$('?search').val();
Which would give me the value "test" in the following URL: http://www.example.com/index.php?search=test.
I've seen a lot of functions that can do this in jQuery and Javascript, but I actually want to extend jQuery to work exactly as it is shown above. I'm not looking for a jQuery plugin, I'm looking for an extension to the jQuery method.

After years of ugly string parsing, there's a better way: URLSearchParams Let's have a look at how we can use this new API to get values from the location!
//Assuming URL has "?post=1234&action=edit"
var urlParams = new URLSearchParams(window.location.search);
console.log(urlParams.has('post')); // true
console.log(urlParams.get('action')); // "edit"
console.log(urlParams.getAll('action')); // ["edit"]
console.log(urlParams.toString()); // "?post=1234&action=edit"
console.log(urlParams.append('active', '1')); // "?
post=1234&action=edit&active=1"
UPDATE : IE is not supported
use this function from an answer below instead of URLSearchParams
$.urlParam = function (name) {
var results = new RegExp('[\?&]' + name + '=([^&#]*)')
.exec(window.location.search);
return (results !== null) ? results[1] || 0 : false;
}
console.log($.urlParam('action')); //edit

Why extend jQuery? What would be the benefit of extending jQuery vs just having a global function?
function qs(key) {
key = key.replace(/[*+?^$.\[\]{}()|\\\/]/g, "\\$&"); // escape RegEx meta chars
var match = location.search.match(new RegExp("[?&]"+key+"=([^&]+)(&|$)"));
return match && decodeURIComponent(match[1].replace(/\+/g, " "));
}
http://jsfiddle.net/gilly3/sgxcL/
An alternative approach would be to parse the entire query string and store the values in an object for later use. This approach doesn't require a regular expression and extends the window.location object (but, could just as easily use a global variable):
location.queryString = {};
location.search.substr(1).split("&").forEach(function (pair) {
if (pair === "") return;
var parts = pair.split("=");
location.queryString[parts[0]] = parts[1] &&
decodeURIComponent(parts[1].replace(/\+/g, " "));
});
http://jsfiddle.net/gilly3/YnCeu/
This version also makes use of Array.forEach(), which is unavailable natively in IE7 and IE8. It can be added by using the implementation at MDN, or you can use jQuery's $.each() instead.

JQuery jQuery-URL-Parser plugin do the same job, for example to retrieve the value of search query string param, you can use
$.url().param('search');
This library is not actively maintained. As suggested by the author of the same plugin, you can use URI.js.
Or you can use js-url instead. Its quite similar to the one below.
So you can access the query param like $.url('?search')

Found this gem from our friends over at SitePoint.
https://www.sitepoint.com/url-parameters-jquery/.
Using PURE jQuery. I just used this and it worked. Tweaked it a bit for example sake.
//URL is http://www.example.com/mypage?ref=registration&email=bobo#example.com
$.urlParam = function (name) {
var results = new RegExp('[\?&]' + name + '=([^&#]*)')
.exec(window.location.search);
return (results !== null) ? results[1] || 0 : false;
}
console.log($.urlParam('ref')); //registration
console.log($.urlParam('email')); //bobo#example.com
Use as you will.

This isn't my code sample, but I've used it in the past.
//First Add this to extend jQuery
$.extend({
getUrlVars: function(){
var vars = [], hash;
var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
for(var i = 0; i < hashes.length; i++)
{
hash = hashes[i].split('=');
vars.push(hash[0]);
vars[hash[0]] = hash[1];
}
return vars;
},
getUrlVar: function(name){
return $.getUrlVars()[name];
}
});
//Second call with this:
// Get object of URL parameters
var allVars = $.getUrlVars();
// Getting URL var by its name
var byName = $.getUrlVar('name');

I wrote a little function where you only have to parse the name of the query parameter. So if you have: ?Project=12&Mode=200&date=2013-05-27 and you want the 'Mode' parameter you only have to parse the 'Mode' name into the function:
function getParameterByName( name ){
var regexS = "[\\?&]"+name+"=([^&#]*)",
regex = new RegExp( regexS ),
results = regex.exec( window.location.search );
if( results == null ){
return "";
} else{
return decodeURIComponent(results[1].replace(/\+/g, " "));
}
}
// example caller:
var result = getParameterByName('Mode');

Building on #Rob Neild's answer above, here is a pure JS adaptation that returns a simple object of decoded query string params (no %20's, etc).
function parseQueryString () {
var parsedParameters = {},
uriParameters = location.search.substr(1).split('&');
for (var i = 0; i < uriParameters.length; i++) {
var parameter = uriParameters[i].split('=');
parsedParameters[parameter[0]] = decodeURIComponent(parameter[1]);
}
return parsedParameters;
}

function parseQueryString(queryString) {
if (!queryString) {
return false;
}
let queries = queryString.split("&"), params = {}, temp;
for (let i = 0, l = queries.length; i < l; i++) {
temp = queries[i].split('=');
if (temp[1] !== '') {
params[temp[0]] = temp[1];
}
}
return params;
}
I use this.

Written in Vanilla Javascript
//Get URL
var loc = window.location.href;
console.log(loc);
var index = loc.indexOf("?");
console.log(loc.substr(index+1));
var splitted = loc.substr(index+1).split('&');
console.log(splitted);
var paramObj = [];
for(var i=0;i<splitted.length;i++){
var params = splitted[i].split('=');
var key = params[0];
var value = params[1];
var obj = {
[key] : value
};
paramObj.push(obj);
}
console.log(paramObj);
//Loop through paramObj to get all the params in query string.

function getQueryStringValue(uri, key) {
var regEx = new RegExp("[\\?&]" + key + "=([^&#]*)");
var matches = uri.match(regEx);
return matches == null ? null : matches[1];
}
function testQueryString(){
var uri = document.getElementById("uri").value;
var searchKey = document.getElementById("searchKey").value;
var result = getQueryStringValue(uri, searchKey);
document.getElementById("result").value = result;
}
<input type="text" id="uri" placeholder="Uri"/>
<input type="text" id="searchKey" placeholder="Search Key"/>
<Button onclick="testQueryString()">Run</Button><br/>
<input type="text" id="result" disabled placeholder="Result"/>