Simple JS Shaper plugin to convert all single quoted strings to double quotes.

quotes.js

/**
 * Usage:
 *  1. git clone git://github.com/olov/jsshaper.git
 *  2. mv quotes.js plugins/
 *  3. node run-shaper.js TARGET_FILE plugins/quotes.js --source > CORRECTLY_QUOTED_FILE
 */
if (typeof define !== 'function') {
	var define = require('amdefine')(module);
}

define(['../shaper', '../fmt', '../ref', '../tkn'], function(Shaper, Fmt, Ref, tkn) {
	"use strict";
	"use restrict";

	var testString = '"embedded "quotes" and \'stuf\'';

	var testObj = {
		unquoted: true,
		"doesnt_need_quotes": true,
		'need\'s quotes': 'singel quoted value',
		'doesnt_need_single': 123,
		'default': "key is a keyword"
	};

	/*jshint newcap:false */
	Shaper("quotes", function(root) {
		return Shaper.traverse(root, {
			pre: function(node, ref) {
				if (node.type === tkn.PROPERTY_INIT) {
					var value = node.children[0].value;
					value = value.match(/^[a-zA-Z_$][0-9a-zA-Z_$]*$/) ?
						// don't quote identifiers that don't need it
						value :
						JSON.stringify(value);
					try {
						value = Shaper.parse(value);
					} catch(e) {
						value = Shaper.parse(JSON.stringify(value));
					}
					node.children[0] = value;
					return node;
				}
				if (node.type === tkn.STRING &&
					// don't stringify a string used as an identifier
					(ref.base.type !== tkn.PROPERTY_INIT || ref.base.children[0] !== node)) {
					return ref.set(Shaper.parse(JSON.stringify(node.value)));
				}
			}
		});
	});

	return Shaper.get("quotes");
});