JSON is simplified subset of JavaScript data syntax.
Adding a few more JS features to JSON would help usability.
The JSON5 Data Interchange Format (json5.org)
"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.Similar to JSON, JSON5 can represent four primitive types (strings, numbers, Booleans, and null) and two structured types (objects and arrays)."
example:
{ // 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", }
GitHub Search · json5
json vs json5 vs yaml | npm trends (json5 = 3 * yaml)
there are also official "readonly" versions in DotNet (C#) and GoLang (go) JSON5 @github
Rust
ANTLR parser grammar for JSON5
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. 🙂)
here is WHY: it is SLOW
JSON5#parse x 327 ops/sec ±6.58% (31 runs sampled)
JSON#parse x 5,940 ops/sec ±5.23% (76 runs sampled)
JSON5#stringify x 1,270 ops/sec ±1.38% (85 runs sampled)
JSON#stringify x 13,748 ops/sec ±2.06% (84 runs sampled)
