jason

jason is a JSON parser and formatter written in JavaScript. It's pretty simple (220 lines with comments and blank lines) and should be pretty fast. It uses moo for lexing, and then iterates over that stream of tokens. It supports proper strings, floats, and some pretty errors. It's kinda pointless because JSON.parse exists, but interesting nonetheless.

install

npm install @ajkachnic/jason

usage

You can selectively import the functions you want using destructuring

Here's a typescript example:

import { parse, format, beautify } from '@ajkachnic/jason'

And here's a commonjs version:

const { parse, format, beautify } = require('@ajkachnic/jason')

api

parse

parse takes a string and returns it's JavaScript equivalent.

Example:

const output = parse('{ "name": "bob", "age": 28.5 }') // { name: "bob", age: 28.5 }

format

format takes a JavaScript value and returns it's JSON encoded counterpart. Please only pass this things that will be properly encoded (class instances and stuff won't be)

It also has a second optional argument for whether or not to pretty-print. This is set to false by default

Example:

const json = format({ name: "bob", age: 28.5 }) // {"name":"bob","age":28.5}

beautify

beautify takes a JSON string and returns a pretty-printed version. It basically just parses it and then runs format on it with pretty printing enabled. It's probably not very fast

Example:

const beautified = beautify('{"name":"bob","age":28.5}') // { "name": "bob", "age": 28.5 }