Parse and stringify URL query strings

Usage no npm install needed!

<script type="module">
  import adnucoderQueryString from 'https://cdn.skypack.dev/@adnucoder/query-string';


query-string Build Status

Parse and stringify URL query strings

Fork from https://github.com/sindresorhus/query-string to add compatibility to IE11


$ npm install @adnucoder/query-string

This module targets Node.js 6 or later and the latest version of Chrome, Firefox, and Safari. If you want support for older browsers, or, if your project is using create-react-app v1, use version 5: npm install query-string@5.


const queryString = require('query-string');

//=> '?foo=bar'

const parsed = queryString.parse(location.search);
//=> {foo: 'bar'}

//=> '#token=bada55cafe'

const parsedHash = queryString.parse(location.hash);
//=> {token: 'bada55cafe'}

parsed.foo = 'unicorn';
parsed.ilike = 'pizza';

const stringified = queryString.stringify(parsed);
//=> 'foo=unicorn&ilike=pizza'

location.search = stringified;
// note that `location.search` automatically prepends a question mark
//=> '?foo=unicorn&ilike=pizza'


.parse(string, options?)

Parse a query string into an object. Leading ? or # are ignored, so you can pass location.search or location.hash directly.

The returned object is created with Object.create(null) and thus does not have a prototype.


Type: object


Type: boolean
Default: true

Decode the keys and values. URL components are decoded with decode-uri-component.


Type: string
Default: 'none'

  • 'bracket': Parse arrays with bracket representation:
queryString.parse('foo[]=1&foo[]=2&foo[]=3', {arrayFormat: 'bracket'});
//=> {foo: ['1', '2', '3']}
  • 'index': Parse arrays with index representation:
queryString.parse('foo[0]=1&foo[1]=2&foo[3]=3', {arrayFormat: 'index'});
//=> {foo: ['1', '2', '3']}
  • 'comma': Parse arrays with elements separated by comma:
queryString.parse('foo=1,2,3', {arrayFormat: 'comma'});
//=> {foo: ['1', '2', '3']}
  • 'none': Parse arrays with elements using duplicate keys:
//=> {foo: ['1', '2', '3']}

Type: Function | boolean
Default: true

Supports both Function as a custom sorting function or false to disable sorting.


Type: boolean
Default: false

queryString.parse('foo=1', {parseNumbers: true});
//=> {foo: 1}

Parse the value as a number type instead of string type if it's a number.


Type: boolean
Default: false

queryString.parse('foo=true', {parseBooleans: true});
//=> {foo: true}

Parse the value as a boolean type instead of string type if it's a boolean.

.stringify(object, [options])

Stringify an object into a query string and sorting the keys.


Type: object


Type: boolean
Default: true

Strictly encode URI components with strict-uri-encode. It uses encodeURIComponent if set to false. You probably don't care about this option.


Type: boolean
Default: true

URL encode the keys and values.


Type: string
Default: 'none'

  • 'bracket': Serialize arrays using bracket representation:
queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'bracket'});
//=> 'foo[]=1&foo[]=2&foo[]=3'
  • 'index': Serialize arrays using index representation:
queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'index'});
//=> 'foo[0]=1&foo[1]=2&foo[2]=3'
  • 'comma': Serialize arrays by separating elements with comma:
queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'comma'});
//=> 'foo=1,2,3'
  • 'none': Serialize arrays by using duplicate keys:
queryString.stringify({foo: [1, 2, 3]});
//=> 'foo=1&foo=2&foo=3'

Type: Function | boolean

Supports both Function as a custom sorting function or false to disable sorting.

const order = ['c', 'a', 'b'];

queryString.stringify({a: 1, b: 2, c: 3}, {
    sort: (a, b) => order.indexOf(a) - order.indexOf(b)
//=> 'c=3&a=1&b=2'
queryString.stringify({b: 1, c: 2, a: 3}, {sort: false});
//=> 'b=1&c=2&a=3'

If omitted, keys are sorted using Array#sort(), which means, converting them to strings and comparing strings in Unicode code point order.


Extract a query string from a URL that can be passed into .parse().

.parseUrl(string, options?)

Extract the URL and the query string as an object.

The options are the same as for .parse().

Returns an object with a url and query property.

//=> {url: 'https://foo.bar', query: {foo: 'bar'}}


This module intentionally doesn't support nesting as it's not spec'd and varies between implementations, which causes a lot of edge cases.

You're much better off just converting the object to a JSON string:

    foo: 'bar',
    nested: JSON.stringify({
        unicorn: 'cake'
//=> 'foo=bar&nested=%7B%22unicorn%22%3A%22cake%22%7D'

However, there is support for multiple instances of the same key:

//=> {likes: ['cake', 'icecream'], name: 'bob'}

queryString.stringify({color: ['taupe', 'chartreuse'], id: '515'});
//=> 'color=taupe&color=chartreuse&id=515'

Falsy values

Sometimes you want to unset a key, or maybe just make it present without assigning a value to it. Here is how falsy values are stringified:

queryString.stringify({foo: false});
//=> 'foo=false'

queryString.stringify({foo: null});
//=> 'foo'

queryString.stringify({foo: undefined});
//=> ''

query-string for enterprise

Available as part of the Tidelift Subscription.

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