ljharbjsonify 
This module provides Douglas Crockford's JSON implementation without modifying any globals.
stringify and parse are merely exported without respect to whether or not a global JSON object exists.
methods
var json = require('jsonify');
json.parse(source, reviver)
Return a new javascript object from a parse of the source string.
If a reviver function is specified, walk the structure passing each name/value pair to reviver.call(parent, key, value) to transform the value before parsing it.
json.stringify(value, replacer, space)
Return a string representation for value.
If replacer is specified, walk the structure passing each name/value pair to replacer.call(parent, key, value) to transform the value before stringifying it.
If space is a number, indent the result by that many spaces.
If space is a string, use space as the indentation.
install
With npm do:
npm install jsonify
To use this module in the browser, check out browserify.
license
public domain