JSON5

JSON5 is an open source data notation created in 2012 by Aseem Kishore.

Source code:

git clone https://github.com/json5/json5

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The JSON5 Data Interchange Format (JSON5) is a superset of JSON that aims to alleviate some of the limitations of JSON by expanding its syntax to include some productions from ECMAScript 5.1.

JSON5 website
JSON5 is developed on GitHub and has 5,161 stars
JSON5 docs
There are at least 0 JSON5 repos on GitHub
JSON5 is a superset of JSON
JSON5 first developed in https://github.com/json5
file extensions for JSON5 include json5
GitHub supports syntax highlighting for JSON5
json5.org was registered in 2011

Example from the web:

{
  // 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",
}

Example from Linguist:

/*
 * The following is a contrived example, but it illustrates most of the features:
 */

{
    foo: 'bar',
    while: true,

    this: 'is a \
multi-line string',

    // this is an inline comment
    here: 'is another', // inline comment

    /* this is a block comment
       that continues on another line */

    hex: 0xDEADbeef,
    half: .5,
    delta: +10,
    to: Infinity,   // and beyond!

    finally: 'a trailing comma',
    oh: [
        "we shouldn't forget",
        'arrays can have',
        'trailing commas too',
    ],
}

Feature	Supported	Token	Example
MultiLine Comments	✓	/* */	/* A comment */
Comments	✓		// A comment
Line Comments	✓	//	// A comment
Lists	✓		[1, 2, 3]
Maps	✓		{"name": "Mary"}
Strings	✓		"hello world"
Integers	✓		80766866
Floats	✓		2.3
Booleans	✓		false
Semantic Indentation	X
Case Insensitive Identifiers	X
Multiline Strings	X
File Imports	X
Ternary operators	X
Conditionals	X
Macros	X
Disk Output	X

JSON5 - Data notation

Language features