[6a3a178] | 1 | # JSON5 – JSON for Humans
|
---|
| 2 |
|
---|
| 3 | [![Build Status](https://travis-ci.com/json5/json5.svg)][Build Status]
|
---|
| 4 | [![Coverage
|
---|
| 5 | Status](https://coveralls.io/repos/github/json5/json5/badge.svg)][Coverage
|
---|
| 6 | Status]
|
---|
| 7 |
|
---|
| 8 | The JSON5 Data Interchange Format (JSON5) is a superset of [JSON] that aims to
|
---|
| 9 | alleviate some of the limitations of JSON by expanding its syntax to include
|
---|
| 10 | some productions from [ECMAScript 5.1].
|
---|
| 11 |
|
---|
| 12 | This JavaScript library is the official reference implementation for JSON5
|
---|
| 13 | parsing and serialization libraries.
|
---|
| 14 |
|
---|
| 15 | [Build Status]: https://travis-ci.com/json5/json5
|
---|
| 16 |
|
---|
| 17 | [Coverage Status]: https://coveralls.io/github/json5/json5
|
---|
| 18 |
|
---|
| 19 | [JSON]: https://tools.ietf.org/html/rfc7159
|
---|
| 20 |
|
---|
| 21 | [ECMAScript 5.1]: https://www.ecma-international.org/ecma-262/5.1/
|
---|
| 22 |
|
---|
| 23 | ## Summary of Features
|
---|
| 24 | The following ECMAScript 5.1 features, which are not supported in JSON, have
|
---|
| 25 | been extended to JSON5.
|
---|
| 26 |
|
---|
| 27 | ### Objects
|
---|
| 28 | - Object keys may be an ECMAScript 5.1 _[IdentifierName]_.
|
---|
| 29 | - Objects may have a single trailing comma.
|
---|
| 30 |
|
---|
| 31 | ### Arrays
|
---|
| 32 | - Arrays may have a single trailing comma.
|
---|
| 33 |
|
---|
| 34 | ### Strings
|
---|
| 35 | - Strings may be single quoted.
|
---|
| 36 | - Strings may span multiple lines by escaping new line characters.
|
---|
| 37 | - Strings may include character escapes.
|
---|
| 38 |
|
---|
| 39 | ### Numbers
|
---|
| 40 | - Numbers may be hexadecimal.
|
---|
| 41 | - Numbers may have a leading or trailing decimal point.
|
---|
| 42 | - Numbers may be [IEEE 754] positive infinity, negative infinity, and NaN.
|
---|
| 43 | - Numbers may begin with an explicit plus sign.
|
---|
| 44 |
|
---|
| 45 | ### Comments
|
---|
| 46 | - Single and multi-line comments are allowed.
|
---|
| 47 |
|
---|
| 48 | ### White Space
|
---|
| 49 | - Additional white space characters are allowed.
|
---|
| 50 |
|
---|
| 51 | [IdentifierName]: https://www.ecma-international.org/ecma-262/5.1/#sec-7.6
|
---|
| 52 |
|
---|
| 53 | [IEEE 754]: http://ieeexplore.ieee.org/servlet/opac?punumber=4610933
|
---|
| 54 |
|
---|
| 55 | ## Short Example
|
---|
| 56 | ```js
|
---|
| 57 | {
|
---|
| 58 | // comments
|
---|
| 59 | unquoted: 'and you can quote me on that',
|
---|
| 60 | singleQuotes: 'I can use "double quotes" here',
|
---|
| 61 | lineBreaks: "Look, Mom! \
|
---|
| 62 | No \\n's!",
|
---|
| 63 | hexadecimal: 0xdecaf,
|
---|
| 64 | leadingDecimalPoint: .8675309, andTrailing: 8675309.,
|
---|
| 65 | positiveSign: +1,
|
---|
| 66 | trailingComma: 'in objects', andIn: ['arrays',],
|
---|
| 67 | "backwardsCompatible": "with JSON",
|
---|
| 68 | }
|
---|
| 69 | ```
|
---|
| 70 |
|
---|
| 71 | ## Specification
|
---|
| 72 | For a detailed explanation of the JSON5 format, please read the [official
|
---|
| 73 | specification](https://json5.github.io/json5-spec/).
|
---|
| 74 |
|
---|
| 75 | ## Installation
|
---|
| 76 | ### Node.js
|
---|
| 77 | ```sh
|
---|
| 78 | npm install json5
|
---|
| 79 | ```
|
---|
| 80 |
|
---|
| 81 | ```js
|
---|
| 82 | const JSON5 = require('json5')
|
---|
| 83 | ```
|
---|
| 84 |
|
---|
| 85 | ### Browsers
|
---|
| 86 | ```html
|
---|
| 87 | <script src="https://unpkg.com/json5@^2.0.0/dist/index.min.js"></script>
|
---|
| 88 | ```
|
---|
| 89 |
|
---|
| 90 | This will create a global `JSON5` variable.
|
---|
| 91 |
|
---|
| 92 | ## API
|
---|
| 93 | The JSON5 API is compatible with the [JSON API].
|
---|
| 94 |
|
---|
| 95 | [JSON API]:
|
---|
| 96 | https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON
|
---|
| 97 |
|
---|
| 98 | ### JSON5.parse()
|
---|
| 99 | Parses a JSON5 string, constructing the JavaScript value or object described by
|
---|
| 100 | the string. An optional reviver function can be provided to perform a
|
---|
| 101 | transformation on the resulting object before it is returned.
|
---|
| 102 |
|
---|
| 103 | #### Syntax
|
---|
| 104 | JSON5.parse(text[, reviver])
|
---|
| 105 |
|
---|
| 106 | #### Parameters
|
---|
| 107 | - `text`: The string to parse as JSON5.
|
---|
| 108 | - `reviver`: If a function, this prescribes how the value originally produced by
|
---|
| 109 | parsing is transformed, before being returned.
|
---|
| 110 |
|
---|
| 111 | #### Return value
|
---|
| 112 | The object corresponding to the given JSON5 text.
|
---|
| 113 |
|
---|
| 114 | ### JSON5.stringify()
|
---|
| 115 | Converts a JavaScript value to a JSON5 string, optionally replacing values if a
|
---|
| 116 | replacer function is specified, or optionally including only the specified
|
---|
| 117 | properties if a replacer array is specified.
|
---|
| 118 |
|
---|
| 119 | #### Syntax
|
---|
| 120 | JSON5.stringify(value[, replacer[, space]])
|
---|
| 121 | JSON5.stringify(value[, options])
|
---|
| 122 |
|
---|
| 123 | #### Parameters
|
---|
| 124 | - `value`: The value to convert to a JSON5 string.
|
---|
| 125 | - `replacer`: A function that alters the behavior of the stringification
|
---|
| 126 | process, or an array of String and Number objects that serve as a whitelist
|
---|
| 127 | for selecting/filtering the properties of the value object to be included in
|
---|
| 128 | the JSON5 string. If this value is null or not provided, all properties of the
|
---|
| 129 | object are included in the resulting JSON5 string.
|
---|
| 130 | - `space`: A String or Number object that's used to insert white space into the
|
---|
| 131 | output JSON5 string for readability purposes. If this is a Number, it
|
---|
| 132 | indicates the number of space characters to use as white space; this number is
|
---|
| 133 | capped at 10 (if it is greater, the value is just 10). Values less than 1
|
---|
| 134 | indicate that no space should be used. If this is a String, the string (or the
|
---|
| 135 | first 10 characters of the string, if it's longer than that) is used as white
|
---|
| 136 | space. If this parameter is not provided (or is null), no white space is used.
|
---|
| 137 | If white space is used, trailing commas will be used in objects and arrays.
|
---|
| 138 | - `options`: An object with the following properties:
|
---|
| 139 | - `replacer`: Same as the `replacer` parameter.
|
---|
| 140 | - `space`: Same as the `space` parameter.
|
---|
| 141 | - `quote`: A String representing the quote character to use when serializing
|
---|
| 142 | strings.
|
---|
| 143 |
|
---|
| 144 | #### Return value
|
---|
| 145 | A JSON5 string representing the value.
|
---|
| 146 |
|
---|
| 147 | ### Node.js `require()` JSON5 files
|
---|
| 148 | When using Node.js, you can `require()` JSON5 files by adding the following
|
---|
| 149 | statement.
|
---|
| 150 |
|
---|
| 151 | ```js
|
---|
| 152 | require('json5/lib/register')
|
---|
| 153 | ```
|
---|
| 154 |
|
---|
| 155 | Then you can load a JSON5 file with a Node.js `require()` statement. For
|
---|
| 156 | example:
|
---|
| 157 |
|
---|
| 158 | ```js
|
---|
| 159 | const config = require('./config.json5')
|
---|
| 160 | ```
|
---|
| 161 |
|
---|
| 162 | ## CLI
|
---|
| 163 | Since JSON is more widely used than JSON5, this package includes a CLI for
|
---|
| 164 | converting JSON5 to JSON and for validating the syntax of JSON5 documents.
|
---|
| 165 |
|
---|
| 166 | ### Installation
|
---|
| 167 | ```sh
|
---|
| 168 | npm install --global json5
|
---|
| 169 | ```
|
---|
| 170 |
|
---|
| 171 | ### Usage
|
---|
| 172 | ```sh
|
---|
| 173 | json5 [options] <file>
|
---|
| 174 | ```
|
---|
| 175 |
|
---|
| 176 | If `<file>` is not provided, then STDIN is used.
|
---|
| 177 |
|
---|
| 178 | #### Options:
|
---|
| 179 | - `-s`, `--space`: The number of spaces to indent or `t` for tabs
|
---|
| 180 | - `-o`, `--out-file [file]`: Output to the specified file, otherwise STDOUT
|
---|
| 181 | - `-v`, `--validate`: Validate JSON5 but do not output JSON
|
---|
| 182 | - `-V`, `--version`: Output the version number
|
---|
| 183 | - `-h`, `--help`: Output usage information
|
---|
| 184 |
|
---|
| 185 | ## Contributing
|
---|
| 186 | ### Development
|
---|
| 187 | ```sh
|
---|
| 188 | git clone https://github.com/json5/json5
|
---|
| 189 | cd json5
|
---|
| 190 | npm install
|
---|
| 191 | ```
|
---|
| 192 |
|
---|
| 193 | When contributing code, please write relevant tests and run `npm test` and `npm
|
---|
| 194 | run lint` before submitting pull requests. Please use an editor that supports
|
---|
| 195 | [EditorConfig](http://editorconfig.org/).
|
---|
| 196 |
|
---|
| 197 | ### Issues
|
---|
| 198 | To report bugs or request features regarding the JSON5 data format, please
|
---|
| 199 | submit an issue to the [official specification
|
---|
| 200 | repository](https://github.com/json5/json5-spec).
|
---|
| 201 |
|
---|
| 202 | To report bugs or request features regarding the JavaScript implementation of
|
---|
| 203 | JSON5, please submit an issue to this repository.
|
---|
| 204 |
|
---|
| 205 | ## License
|
---|
| 206 | MIT. See [LICENSE.md](./LICENSE.md) for details.
|
---|
| 207 |
|
---|
| 208 | ## Credits
|
---|
| 209 | [Assem Kishore](https://github.com/aseemk) founded this project.
|
---|
| 210 |
|
---|
| 211 | [Michael Bolin](http://bolinfest.com/) independently arrived at and published
|
---|
| 212 | some of these same ideas with awesome explanations and detail. Recommended
|
---|
| 213 | reading: [Suggested Improvements to JSON](http://bolinfest.com/essays/json.html)
|
---|
| 214 |
|
---|
| 215 | [Douglas Crockford](http://www.crockford.com/) of course designed and built
|
---|
| 216 | JSON, but his state machine diagrams on the [JSON website](http://json.org/), as
|
---|
| 217 | cheesy as it may sound, gave us motivation and confidence that building a new
|
---|
| 218 | parser to implement these ideas was within reach! The original
|
---|
| 219 | implementation of JSON5 was also modeled directly off of Doug’s open-source
|
---|
| 220 | [json_parse.js] parser. We’re grateful for that clean and well-documented
|
---|
| 221 | code.
|
---|
| 222 |
|
---|
| 223 | [json_parse.js]:
|
---|
| 224 | https://github.com/douglascrockford/JSON-js/blob/03157639c7a7cddd2e9f032537f346f1a87c0f6d/json_parse.js
|
---|
| 225 |
|
---|
| 226 | [Max Nanasy](https://github.com/MaxNanasy) has been an early and prolific
|
---|
| 227 | supporter, contributing multiple patches and ideas.
|
---|
| 228 |
|
---|
| 229 | [Andrew Eisenberg](https://github.com/aeisenberg) contributed the original
|
---|
| 230 | `stringify` method.
|
---|
| 231 |
|
---|
| 232 | [Jordan Tucker](https://github.com/jordanbtucker) has aligned JSON5 more closely
|
---|
| 233 | with ES5, wrote the official JSON5 specification, completely rewrote the
|
---|
| 234 | codebase from the ground up, and is actively maintaining this project.
|
---|