JSONC Simple Parser

A simple JSON parser that supports comments and optional trailing commas.

Features

• Tiny:
  • It's ~3.5kb minified and gzipped, if you aren't already using RegHex, otherwise it's just ~2kb.
  • Even if you aren't using RegHex already (you should) that's ~32% smaller than VS Code's jsonc-parser and ~62% smaller than JSON5.
• Performant:
  • When parsing regular JSON it's ~10x faster than VS Code's jsonc-parser, ~70x faster than JSON5 and just as fast as the native JSON.parse.
  • When parsing JSON with comments or trailing commas it's just as fast as VS Code's jsonc-parser and ~6x faster than JSON5.
• Tested:
  • It passes all 274 tests regarding JSON from ECMA's test262 test suite.
  • The parser is obviously not spec compliant but this means that while adding support for comments and trailing commas probably nothing else got broken.

Install

1npm install --save jsonc-simple-parser

Usage

1import JSONC from 'jsonc-simple-parser';
2
3const source = `
4  { // This is an example
5    "foo": 123,
6    /* TRAILING COMMAS */
7    "bar": [1, 2, 3,],
8  }
9`;
10
11const result = {
12  foo: 123,
13  bar: [1, 2, 3]
14};
15
16JSONC.parse ( source ); // => returns an object that's deeply equal to `result`
17JSONC.stringify ( result ); // => same as calling `JSON.stringify`

License

MIT © Fabio Spampinato