Quick JSON5

Fast JSON5 parser and serializer.

• Written in pure TypeScript (JavaScript)
• Parses up to 10x faster than reference JSON5 implementation
• Tested for 100% compliance with the official JSON5 specification
• Fully supports replacer and space properties in stringify, and reviver in parse (including the new context callback argument)
• Support several extensions to the JSON5 standard (optional)
• Improved validation and error reporting. Errors embed machine-readable positional metadata
• No external dependencies

Support for extended numeric literals, beyond JSON5 (optional)

Parser also supports additional numeric literal syntax added in later versions of ECMAScript:

• Octal literals (0o1234567), and binary literals (0b1001011). Introduced in ES2015
• BigInt numeric literals (123412341234n). Introduced in ES2020
• Underscore separators in numeric literals (123_456_789, 123.456_789, 0b0110_1101). Introduced in ES2021

Enabling these extensions requires the enableJson5Extensions option to be set to true in the options argument for the parseJSON5 and stringifyJSON5 methods.

Usage examples

Installation:

npm install quick-json5

JSON5 serializer and parser:

import { stringifyJSON5, parseJSON5 } from 'quick-json5'

const json5Str = stringifyJSON5({ 'hello': 123 })
const parsedObject = parseJSON5(json5Str)

JSON5 serializer and parser with extensions enabled:

import { stringifyJSON5, parseJSON5 } from 'quick-json5'

const options ={ enableJson5Extensions: true }

const json5Str = stringifyJSON5({ 'hello': 12356123456123456n }, undefined, 4, options)
const parsedObject = parseJSON5(json5Str, undefined, options)

Plain JSON serializer and parser:

import { stringifyJSON, parseJSON } from 'quick-json5'

const jsonStr = stringifyJSON({ 'hello': 123 })
const parsedObject = parseJSON(jsonStr)

License

MIT