| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
										
									
								 | 
							
							
								# JSON5 – JSON for Humans
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[][Build
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Status] [][Coverage
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Status]
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								JSON5 is an extension to the popular [JSON] file format that aims to be
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								easier to **write and maintain _by hand_ (e.g. for config files)**.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								It is _not intended_ to be used for machine-to-machine communication.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								(Keep using JSON or other file formats for that. 🙂)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								JSON5 was started in 2012, and as of 2022, now gets **[>65M downloads/week](https://www.npmjs.com/package/json5)**,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								ranks in the **[top 0.1%](https://gist.github.com/anvaka/8e8fa57c7ee1350e3491)** of the most depended-upon packages on npm,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								and has been adopted by major projects like
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								**[Chromium](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5;drc=5de823b36e68fd99009a29281b17bc3a1d6b329c),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Next.js](https://github.com/vercel/next.js/blob/b88f20c90bf4659b8ad5cb2a27956005eac2c7e8/packages/next/lib/find-config.ts#L43-L46),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Babel](https://babeljs.io/docs/en/config-files#supported-file-extensions),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Retool](https://community.retool.com/t/i-am-attempting-to-append-several-text-fields-to-a-google-sheet-but-receiving-a-json5-invalid-character-error/7626),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[WebStorm](https://www.jetbrains.com/help/webstorm/json.html),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								and [more](https://github.com/json5/json5/wiki/In-the-Wild)**.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								It's also natively supported on **[Apple platforms](https://developer.apple.com/documentation/foundation/jsondecoder/3766916-allowsjson5)**
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								like **MacOS** and **iOS**.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Formally, the **[JSON5 Data Interchange Format](https://spec.json5.org/)** is a superset of JSON
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								(so valid JSON files will always be valid JSON5 files)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								that expands its syntax to include some productions from [ECMAScript 5.1] (ES5).
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								It's also a strict _subset_ of ES5, so valid JSON5 files will always be valid ES5.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								This JavaScript library is a reference implementation for JSON5 parsing and serialization,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								and is directly used in many of the popular projects mentioned above
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								(where e.g. extreme performance isn't necessary),
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								but others have created [many other libraries](https://github.com/json5/json5/wiki/In-the-Wild)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								across many other platforms.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Build Status]: https://app.travis-ci.com/json5/json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Coverage Status]: https://coveralls.io/github/json5/json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[JSON]: https://tools.ietf.org/html/rfc7159
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[ECMAScript 5.1]: https://www.ecma-international.org/ecma-262/5.1/
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Summary of Features
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								The following ECMAScript 5.1 features, which are not supported in JSON, have
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								been extended to JSON5.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Objects
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Object keys may be an ECMAScript 5.1 _[IdentifierName]_.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Objects may have a single trailing comma.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Arrays
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Arrays may have a single trailing comma.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Strings
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Strings may be single quoted.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Strings may span multiple lines by escaping new line characters.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Strings may include character escapes.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Numbers
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Numbers may be hexadecimal.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Numbers may have a leading or trailing decimal point.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Numbers may be [IEEE 754] positive infinity, negative infinity, and NaN.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Numbers may begin with an explicit plus sign.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Comments
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Single and multi-line comments are allowed.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### White Space
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- Additional white space characters are allowed.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[IdentifierName]: https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[IEEE 754]: http://ieeexplore.ieee.org/servlet/opac?punumber=4610933
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Example
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Kitchen-sink example:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								{
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  // comments
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  unquoted: 'and you can quote me on that',
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  singleQuotes: 'I can use "double quotes" here',
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  lineBreaks: "Look, Mom! \
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								No \\n's!",
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  hexadecimal: 0xdecaf,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  leadingDecimalPoint: .8675309, andTrailing: 8675309.,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  positiveSign: +1,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  trailingComma: 'in objects', andIn: ['arrays',],
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  "backwardsCompatible": "with JSON",
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								}
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								A more real-world example is [this config file](https://github.com/chromium/chromium/blob/feb3c9f670515edf9a88f185301cbd7794ee3e52/third_party/blink/renderer/platform/runtime_enabled_features.json5)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								from the Chromium/Blink project.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Specification
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								For a detailed explanation of the JSON5 format, please read the [official
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								specification](https://json5.github.io/json5-spec/).
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Installation and Usage
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Node.js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```sh
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								npm install json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### CommonJS
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								const JSON5 = require('json5')
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Modules
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								import JSON5 from 'json5'
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Browsers
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### UMD
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```html
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								<!-- This will create a global `JSON5` variable. -->
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								<script src="https://unpkg.com/json5@2/dist/index.min.js"></script>
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Modules
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```html
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								<script type="module">
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  import JSON5 from 'https://unpkg.com/json5@2/dist/index.min.mjs'
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								</script>
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## API
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								The JSON5 API is compatible with the [JSON API].
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[JSON API]:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### JSON5.parse()
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Parses a JSON5 string, constructing the JavaScript value or object described by
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								the string. An optional reviver function can be provided to perform a
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								transformation on the resulting object before it is returned.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Syntax
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								    JSON5.parse(text[, reviver])
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Parameters
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `text`: The string to parse as JSON5.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `reviver`: If a function, this prescribes how the value originally produced by
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  parsing is transformed, before being returned.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Return value
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								The object corresponding to the given JSON5 text.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### JSON5.stringify()
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Converts a JavaScript value to a JSON5 string, optionally replacing values if a
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								replacer function is specified, or optionally including only the specified
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								properties if a replacer array is specified.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Syntax
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								    JSON5.stringify(value[, replacer[, space]])
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								    JSON5.stringify(value[, options])
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Parameters
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `value`: The value to convert to a JSON5 string.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `replacer`: A function that alters the behavior of the stringification
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  process, or an array of String and Number objects that serve as a whitelist
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  for selecting/filtering the properties of the value object to be included in
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  the JSON5 string. If this value is null or not provided, all properties of the
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  object are included in the resulting JSON5 string.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `space`: A String or Number object that's used to insert white space into the
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  output JSON5 string for readability purposes. If this is a Number, it
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  indicates the number of space characters to use as white space; this number is
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  capped at 10 (if it is greater, the value is just 10). Values less than 1
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  indicate that no space should be used. If this is a String, the string (or the
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  first 10 characters of the string, if it's longer than that) is used as white
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  space. If this parameter is not provided (or is null), no white space is used.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  If white space is used, trailing commas will be used in objects and arrays.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `options`: An object with the following properties:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  - `replacer`: Same as the `replacer` parameter.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  - `space`: Same as the `space` parameter.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								  - `quote`: A String representing the quote character to use when serializing
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								    strings.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Return value
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								A JSON5 string representing the value.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Node.js `require()` JSON5 files
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								When using Node.js, you can `require()` JSON5 files by adding the following
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								statement.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								require('json5/lib/register')
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Then you can load a JSON5 file with a Node.js `require()` statement. For
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								example:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								const config = require('./config.json5')
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## CLI
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Since JSON is more widely used than JSON5, this package includes a CLI for
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								converting JSON5 to JSON and for validating the syntax of JSON5 documents.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Installation
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```sh
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								npm install --global json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Usage
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```sh
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								json5 [options] <file>
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								If `<file>` is not provided, then STDIN is used.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								#### Options:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `-s`, `--space`: The number of spaces to indent or `t` for tabs
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `-o`, `--out-file [file]`: Output to the specified file, otherwise STDOUT
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `-v`, `--validate`: Validate JSON5 but do not output JSON
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `-V`, `--version`: Output the version number
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								- `-h`, `--help`: Output usage information
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Contributing
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Development
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```sh
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								git clone https://github.com/json5/json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								cd json5
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								npm install
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								```
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								When contributing code, please write relevant tests and run `npm test` and `npm
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								run lint` before submitting pull requests. Please use an editor that supports
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[EditorConfig](http://editorconfig.org/).
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								### Issues
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								To report bugs or request features regarding the JSON5 **data format**,
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								please submit an issue to the official
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								**[_specification_ repository](https://github.com/json5/json5-spec)**.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Note that we will never add any features that make JSON5 incompatible with ES5;
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								that compatibility is a fundamental premise of JSON5.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								To report bugs or request features regarding this **JavaScript implementation**
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								of JSON5, please submit an issue to **_this_ repository**.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## License
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								MIT. See [LICENSE.md](./LICENSE.md) for details.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								## Credits
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Aseem Kishore](https://github.com/aseemk) founded this project.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								He wrote a [blog post](https://aseemk.substack.com/p/ignore-the-f-ing-haters-json5)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								about the journey and lessons learned 10 years in.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Michael Bolin](http://bolinfest.com/) independently arrived at and published
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								some of these same ideas with awesome explanations and detail. Recommended
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								reading: [Suggested Improvements to JSON](http://bolinfest.com/essays/json.html)
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Douglas Crockford](http://www.crockford.com/) of course designed and built
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								JSON, but his state machine diagrams on the [JSON website](http://json.org/), as
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								cheesy as it may sound, gave us motivation and confidence that building a new
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								parser to implement these ideas was within reach! The original
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
										
									
								 | 
							
							
								implementation of JSON5 was also modeled directly off of Doug’s open-source
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
										
									
								 | 
							
							
								[json_parse.js] parser. We’re grateful for that clean and well-documented
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								code.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[json_parse.js]:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								https://github.com/douglascrockford/JSON-js/blob/03157639c7a7cddd2e9f032537f346f1a87c0f6d/json_parse.js
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Max Nanasy](https://github.com/MaxNanasy) has been an early and prolific
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								supporter, contributing multiple patches and ideas.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Andrew Eisenberg](https://github.com/aeisenberg) contributed the original
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								`stringify` method.
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								[Jordan Tucker](https://github.com/jordanbtucker) has aligned JSON5 more closely
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								with ES5, wrote the official JSON5 specification, completely rewrote the
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								codebase from the ground up, and is actively maintaining this project.
							 |