• Stars
    star
    6,453
  • Rank 5,808 (Top 0.2 %)
  • Language
    JavaScript
  • License
    MIT License
  • Created over 10 years ago
  • Updated 8 months ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

Parse and stringify URL query strings

query-string

Parse and stringify URL query strings





Install

npm install query-string

Not npm install querystring!!!!!

For browser usage, this package targets the latest version of Chrome, Firefox, and Safari.

Usage

import queryString from 'query-string';

console.log(location.search);
//=> '?foo=bar'

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

console.log(location.hash);
//=> '#token=bada55cafe'

const parsedHash = queryString.parse(location.hash);
console.log(parsedHash);
//=> {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
console.log(location.search);
//=> '?foo=unicorn&ilike=pizza'

API

.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.

options

Type: object

decode

Type: boolean
Default: true

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

arrayFormat

Type: string
Default: 'none'

  • 'bracket': Parse arrays with bracket representation:
import queryString from 'query-string';

queryString.parse('foo[]=1&foo[]=2&foo[]=3', {arrayFormat: 'bracket'});
//=> {foo: ['1', '2', '3']}
  • 'index': Parse arrays with index representation:
import queryString from 'query-string';

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:
import queryString from 'query-string';

queryString.parse('foo=1,2,3', {arrayFormat: 'comma'});
//=> {foo: ['1', '2', '3']}
  • 'separator': Parse arrays with elements separated by a custom character:
import queryString from 'query-string';

queryString.parse('foo=1|2|3', {arrayFormat: 'separator', arrayFormatSeparator: '|'});
//=> {foo: ['1', '2', '3']}
  • 'bracket-separator': Parse arrays (that are explicitly marked with brackets) with elements separated by a custom character:
import queryString from 'query-string';

queryString.parse('foo[]', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: []}

queryString.parse('foo[]=', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: ['']}

queryString.parse('foo[]=1', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: ['1']}

queryString.parse('foo[]=1|2|3', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: ['1', '2', '3']}

queryString.parse('foo[]=1||3|||6', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: ['1', '', 3, '', '', '6']}

queryString.parse('foo[]=1|2|3&bar=fluffy&baz[]=4', {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> {foo: ['1', '2', '3'], bar: 'fluffy', baz:['4']}
  • 'colon-list-separator': Parse arrays with parameter names that are explicitly marked with :list:
import queryString from 'query-string';

queryString.parse('foo:list=one&foo:list=two', {arrayFormat: 'colon-list-separator'});
//=> {foo: ['one', 'two']}
  • 'none': Parse arrays with elements using duplicate keys:
import queryString from 'query-string';

queryString.parse('foo=1&foo=2&foo=3');
//=> {foo: ['1', '2', '3']}
arrayFormatSeparator

Type: string
Default: ','

The character used to separate array elements when using {arrayFormat: 'separator'}.

sort

Type: Function | boolean
Default: true

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

parseNumbers

Type: boolean
Default: false

import queryString from 'query-string';

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

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

parseBooleans

Type: boolean
Default: false

import queryString from 'query-string';

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.

options

Type: object

strict

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.

encode

Type: boolean
Default: true

URL encode the keys and values.

arrayFormat

Type: string
Default: 'none'

  • 'bracket': Serialize arrays using bracket representation:
import queryString from 'query-string';

queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'bracket'});
//=> 'foo[]=1&foo[]=2&foo[]=3'
  • 'index': Serialize arrays using index representation:
import queryString from 'query-string';

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:
import queryString from 'query-string';

queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'comma'});
//=> 'foo=1,2,3'

queryString.stringify({foo: [1, null, '']}, {arrayFormat: 'comma'});
//=> 'foo=1,,'
// Note that typing information for null values is lost
// and `.parse('foo=1,,')` would return `{foo: [1, '', '']}`.
  • 'separator': Serialize arrays by separating elements with a custom character:
import queryString from 'query-string';

queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'separator', arrayFormatSeparator: '|'});
//=> 'foo=1|2|3'
  • 'bracket-separator': Serialize arrays by explicitly post-fixing array names with brackets and separating elements with a custom character:
import queryString from 'query-string';

queryString.stringify({foo: []}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]'

queryString.stringify({foo: ['']}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]='

queryString.stringify({foo: [1]}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]=1'

queryString.stringify({foo: [1, 2, 3]}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]=1|2|3'

queryString.stringify({foo: [1, '', 3, null, null, 6]}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]=1||3|||6'

queryString.stringify({foo: [1, '', 3, null, null, 6]}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|', skipNull: true});
//=> 'foo[]=1||3|6'

queryString.stringify({foo: [1, 2, 3], bar: 'fluffy', baz: [4]}, {arrayFormat: 'bracket-separator', arrayFormatSeparator: '|'});
//=> 'foo[]=1|2|3&bar=fluffy&baz[]=4'
  • 'colon-list-separator': Serialize arrays with parameter names that are explicitly marked with :list:
import queryString from 'query-string';

queryString.stringify({foo: ['one', 'two']}, {arrayFormat: 'colon-list-separator'});
//=> 'foo:list=one&foo:list=two'
  • 'none': Serialize arrays by using duplicate keys:
import queryString from 'query-string';

queryString.stringify({foo: [1, 2, 3]});
//=> 'foo=1&foo=2&foo=3'
arrayFormatSeparator

Type: string
Default: ','

The character used to separate array elements when using {arrayFormat: 'separator'}.

sort

Type: Function | boolean

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

import queryString from 'query-string';

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'
import queryString from 'query-string';

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.

skipNull

Skip keys with null as the value.

Note that keys with undefined as the value are always skipped.

Type: boolean
Default: false

import queryString from 'query-string';

queryString.stringify({a: 1, b: undefined, c: null, d: 4}, {
	skipNull: true
});
//=> 'a=1&d=4'
import queryString from 'query-string';

queryString.stringify({a: undefined, b: null}, {
	skipNull: true
});
//=> ''
skipEmptyString

Skip keys with an empty string as the value.

Type: boolean
Default: false

import queryString from 'query-string';

queryString.stringify({a: 1, b: '', c: '', d: 4}, {
	skipEmptyString: true
});
//=> 'a=1&d=4'
import queryString from 'query-string';

queryString.stringify({a: '', b: ''}, {
	skipEmptyString: true
});
//=> ''

.extract(string)

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

Note: This behaviour can be changed with the skipNull option.

.parseUrl(string, options?)

Extract the URL and the query string as an object.

Returns an object with a url and query property.

If the parseFragmentIdentifier option is true, the object will also contain a fragmentIdentifier property.

import queryString from 'query-string';

queryString.parseUrl('https://foo.bar?foo=bar');
//=> {url: 'https://foo.bar', query: {foo: 'bar'}}

queryString.parseUrl('https://foo.bar?foo=bar#xyz', {parseFragmentIdentifier: true});
//=> {url: 'https://foo.bar', query: {foo: 'bar'}, fragmentIdentifier: 'xyz'}

options

Type: object

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

Extra options are as below.

parseFragmentIdentifier

Parse the fragment identifier from the URL.

Type: boolean
Default: false

import queryString from 'query-string';

queryString.parseUrl('https://foo.bar?foo=bar#xyz', {parseFragmentIdentifier: true});
//=> {url: 'https://foo.bar', query: {foo: 'bar'}, fragmentIdentifier: 'xyz'}

.stringifyUrl(object, options?)

Stringify an object into a URL with a query string and sorting the keys. The inverse of .parseUrl()

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

Returns a string with the URL and a query string.

Query items in the query property overrides queries in the url property.

The fragmentIdentifier property overrides the fragment identifier in the url property.

queryString.stringifyUrl({url: 'https://foo.bar', query: {foo: 'bar'}});
//=> 'https://foo.bar?foo=bar'

queryString.stringifyUrl({url: 'https://foo.bar?foo=baz', query: {foo: 'bar'}});
//=> 'https://foo.bar?foo=bar'

queryString.stringifyUrl({
	url: 'https://foo.bar',
	query: {
		top: 'foo'
	},
	fragmentIdentifier: 'bar'
});
//=> 'https://foo.bar?top=foo#bar'

object

Type: object

url

Type: string

The URL to stringify.

query

Type: object

Query items to add to the URL.

.pick(url, keys, options?)

.pick(url, filter, options?)

Pick query parameters from a URL.

Returns a string with the new URL.

import queryString from 'query-string';

queryString.pick('https://foo.bar?foo=1&bar=2#hello', ['foo']);
//=> 'https://foo.bar?foo=1#hello'

queryString.pick('https://foo.bar?foo=1&bar=2#hello', (name, value) => value === 2, {parseNumbers: true});
//=> 'https://foo.bar?bar=2#hello'

.exclude(url, keys, options?)

.exclude(url, filter, options?)

Exclude query parameters from a URL.

Returns a string with the new URL.

import queryString from 'query-string';

queryString.exclude('https://foo.bar?foo=1&bar=2#hello', ['foo']);
//=> 'https://foo.bar?bar=2#hello'

queryString.exclude('https://foo.bar?foo=1&bar=2#hello', (name, value) => value === 2, {parseNumbers: true});
//=> 'https://foo.bar?foo=1#hello'

url

Type: string

The URL containing the query parameters to filter.

keys

Type: string[]

The names of the query parameters to filter based on the function used.

filter

Type: (key, value) => boolean

A filter predicate that will be provided the name of each query parameter and its value. The parseNumbers and parseBooleans options also affect value.

options

Type: object

Parse options and stringify options.

Nesting

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:

import queryString from 'query-string';

queryString.stringify({
	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:

import queryString from 'query-string';

queryString.parse('likes=cake&name=bob&likes=icecream');
//=> {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:

import queryString from 'query-string';

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

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

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

FAQ

Why is it parsing + as a space?

See this answer.

More Repositories

1

awesome

😎 Awesome lists about all kinds of interesting topics
270,042
star
2

awesome-nodejs

⚡ Delightful Node.js packages and resources
52,854
star
3

awesome-electron

Useful resources for creating apps with Electron
25,164
star
4

quick-look-plugins

List of useful Quick Look plugins for developers
17,497
star
5

got

🌐 Human-friendly and powerful HTTP request library for Node.js
TypeScript
13,714
star
6

type-fest

A collection of essential TypeScript types
TypeScript
12,930
star
7

pure

Pretty, minimal and fast ZSH prompt
Shell
12,391
star
8

ky

🌳 Tiny & elegant JavaScript HTTP client based on the browser Fetch API
TypeScript
11,367
star
9

pageres

Capture website screenshots
TypeScript
9,573
star
10

ora

Elegant terminal spinner
JavaScript
8,591
star
11

github-markdown-css

The minimal amount of CSS to replicate the GitHub Markdown style
CSS
7,421
star
12

np

A better `npm publish`
JavaScript
7,395
star
13

screenfull

Simple wrapper for cross-browser usage of the JavaScript Fullscreen API
HTML
6,891
star
14

caprine

Elegant Facebook Messenger desktop app
TypeScript
6,816
star
15

Gifski

🌈 Convert videos to high-quality GIFs on your Mac
Swift
6,807
star
16

fkill-cli

Fabulously kill processes. Cross-platform.
JavaScript
6,782
star
17

execa

Process execution for humans
JavaScript
6,019
star
18

modern-normalize

🐒 Normalize browsers' default style
TypeScript
5,038
star
19

css-in-readme-like-wat

Style your readme using CSS with this simple trick
5,013
star
20

awesome-npm

Awesome npm resources and tips
4,315
star
21

promise-fun

Promise packages, patterns, chat, and tutorials
4,277
star
22

electron-store

Simple data persistence for your Electron app or module - Save and load user preferences, app state, cache, etc
JavaScript
4,165
star
23

awesome-scifi

Sci-Fi worth consuming
4,057
star
24

create-dmg

Create a good-looking DMG for your macOS app in seconds
JavaScript
3,950
star
25

speed-test

Test your internet connection speed and ping using speedtest.net from the CLI
JavaScript
3,882
star
26

ow

Function argument validation for humans
TypeScript
3,779
star
27

eslint-plugin-unicorn

More than 100 powerful ESLint rules
JavaScript
3,765
star
28

file-type

Detect the file type of a Buffer/Uint8Array/ArrayBuffer
JavaScript
3,438
star
29

meow

🐈 CLI app helper
JavaScript
3,305
star
30

p-queue

Promise queue with concurrency control
TypeScript
3,202
star
31

open

Open stuff like URLs, files, executables. Cross-platform.
JavaScript
2,976
star
32

Plash

💦 Make any website your Mac desktop wallpaper
Swift
2,735
star
33

alfy

Create Alfred workflows with ease
JavaScript
2,570
star
34

trash

Move files and directories to the trash
JavaScript
2,512
star
35

fast-cli

Test your download and upload speed using fast.com
JavaScript
2,484
star
36

guides

A collection of succinct guides - Public Domain
2,424
star
37

globby

User-friendly glob matching
JavaScript
2,376
star
38

slugify

Slugify a string
JavaScript
2,357
star
39

emoj

Find relevant emoji from text on the command-line 😮 ✨ 🙌 🐴 💥 🙈
JavaScript
2,311
star
40

cli-spinners

Spinners for use in the terminal
JavaScript
2,255
star
41

on-change

Watch an object or array for changes
JavaScript
1,946
star
42

devtools-detect

Detect if DevTools is open and its orientation
HTML
1,924
star
43

touch-bar-simulator

Use the Touch Bar on any Mac
Swift
1,892
star
44

gulp-imagemin

Minify PNG, JPEG, GIF and SVG images
JavaScript
1,888
star
45

notifier-for-github

Browser extension - Get notified about new GitHub notifications
JavaScript
1,760
star
46

editorconfig-sublime

Sublime Text plugin for EditorConfig - Helps developers maintain consistent coding styles between different editors
Python
1,757
star
47

capture-website

Capture screenshots of websites
JavaScript
1,670
star
48

emittery

Simple and modern async event emitter
JavaScript
1,664
star
49

Defaults

💾 Swifty and modern UserDefaults
Swift
1,661
star
50

electron-boilerplate

Boilerplate to kickstart creating an app with Electron
JavaScript
1,632
star
51

pageres-cli

Capture website screenshots
JavaScript
1,620
star
52

is

Type check values
TypeScript
1,605
star
53

clipboardy

Access the system clipboard (copy/paste)
JavaScript
1,598
star
54

gulp-rev

Static asset revisioning by appending content hash to filenames: `unicorn.css` → `unicorn-d41d8cd98f.css`
JavaScript
1,538
star
55

pify

Promisify a callback-style function
JavaScript
1,494
star
56

boxen

Create boxes in the terminal
JavaScript
1,458
star
57

Actions

⚙️ Supercharge your shortcuts
Swift
1,437
star
58

multiline

Multiline strings in JavaScript
JavaScript
1,424
star
59

hyper-snazzy

Elegant Hyper theme with bright colors
JavaScript
1,412
star
60

amas

Awesome & Marvelous Amas
1,392
star
61

LaunchAtLogin

Add “Launch at Login” functionality to your macOS app in seconds
Swift
1,346
star
62

refined-twitter

Browser extension that simplifies the Twitter interface and adds useful features
JavaScript
1,313
star
63

KeyboardShortcuts

⌨️ Add user-customizable global keyboard shortcuts (hotkeys) to your macOS app in minutes
Swift
1,313
star
64

iterm2-snazzy

Elegant iTerm2 theme with bright colors
1,313
star
65

del

Delete files and directories
JavaScript
1,305
star
66

electron-context-menu

Context menu for your Electron app
JavaScript
1,297
star
67

p-limit

Run multiple promise-returning & async functions with limited concurrency
JavaScript
1,294
star
68

Settings

⚙ Add a settings window to your macOS app in minutes
Swift
1,282
star
69

trash-cli

Move files and folders to the trash
JavaScript
1,244
star
70

electron-util

Useful utilities for Electron apps and modules
JavaScript
1,188
star
71

is-online

Check if the internet connection is up
JavaScript
1,181
star
72

ponyfill

🦄 Like polyfill but with pony pureness
1,136
star
73

conf

Simple config handling for your app or module
TypeScript
1,109
star
74

anatine

[DEPRECATED] 🐦 Pristine Twitter app
JavaScript
1,097
star
75

electron-dl

Simplified file downloads for your Electron app
JavaScript
1,087
star
76

log-update

Log by overwriting the previous output in the terminal. Useful for rendering progress bars, animations, etc.
JavaScript
1,027
star
77

pretty-bytes

Convert bytes to a human readable string: 1337 → 1.34 kB
JavaScript
1,022
star
78

grunt-sass

Compile Sass to CSS
JavaScript
1,020
star
79

mem

Memoize functions - an optimization technique used to speed up consecutive function calls by caching the result of calls with identical input
TypeScript
1,019
star
80

DockProgress

Show progress in your app's Dock icon
Swift
1,003
star
81

wallpaper

Manage the desktop wallpaper
JavaScript
996
star
82

p-map

Map over promises concurrently
JavaScript
996
star
83

public-ip

Get your public IP address - very fast!
JavaScript
979
star
84

gulp-app

[DEPRECATED] Gulp as an app
JavaScript
961
star
85

grunt-shell

Run shell commands
JavaScript
952
star
86

load-grunt-tasks

Load multiple grunt tasks using globbing patterns
JavaScript
940
star
87

hasha

Hashing made simple. Get the hash of a buffer/string/stream/file.
JavaScript
934
star
88

pretty-ms

Convert milliseconds to a human readable string: `1337000000` → `15d 11h 23m 20s`
JavaScript
929
star
89

terminal-image

Display images in the terminal
JavaScript
923
star
90

object-assign

ES2015 Object.assign() ponyfill
JavaScript
919
star
91

copy-text-to-clipboard

Copy text to the clipboard in modern browsers (0.2 kB)
JavaScript
858
star
92

System-Color-Picker

🎨 The macOS color picker as an app with more features
Swift
842
star
93

get-port

Get an available TCP port
JavaScript
817
star
94

atom-editorconfig

Helps developers maintain consistent coding styles between different editors
JavaScript
815
star
95

normalize-url

Normalize a URL
JavaScript
807
star
96

grunt-concurrent

Run grunt tasks concurrently
JavaScript
799
star
97

dot-prop

Get, set, or delete a property from a nested object using a dot path
JavaScript
777
star
98

p-progress

Create a promise that reports progress
TypeScript
751
star
99

gulp-changed

Only pass through changed files
JavaScript
747
star
100

generator-nm

Scaffold out a node module
JavaScript
742
star