json/5

• JSON5 – JSON for Humans | JSON5

  • About

    • extension to json that aims to be easier to write and maintain by hand (e.g. for config files).
    • superset of json; valid JSON files will always be valid JSON5 files
      • a subset of ES5; valid JSON5 files will always be valid ES5
      • expands its syntax to include some productions from ECMAScript 5.1 (ES5).

    • My Notes

      • allows
        • Code/Comment (both single-line and multi-line)
        • Trailing commas in objects and arrays
        • Unquoted property names
        • More relaxed string syntax

  • #Example

    • json5

      {
        // 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",
      }

  • started in 2012, and as of 2022, gets >65M downloads/week, ranks in the top 0.1% of the most depended-upon packages on npm, and has been adopted by major projects like Chromium, Next.js, Babel, Retool, WebStorm, and more. It's also natively supported on Apple platforms like MacOS and iOS.