Difference between json.js and json2.js - json

Question

Can someone tell me what the difference is between the 2 JSON parsers?
https://github.com/douglascrockford/JSON-js/blob/master/json.js
https://github.com/douglascrockford/JSON-js/blob/master/json2.js
I have a JSON file from 2007-04-13 (It has methods such as parseJSON). I don't see these methods in any of the new versions.

Answer 1

From their code:
// Augment the basic prototypes if they have not already been augmented.
// These forms are obsolete. It is recommended that JSON.stringify and
// JSON.parse be used instead.
if (!Object.prototype.toJSONString) {
Object.prototype.toJSONString = function (filter) {
return JSON.stringify(this, filter);
};
Object.prototype.parseJSON = function (filter) {
return JSON.parse(this, filter);
};
}
I guess parseJSON is obsolete, therefore the new version (json2) doesn't even use it anymore. However if your code uses parseJSON a lot you could just add this piece of code somewhere to make it work again:
Object.prototype.parseJSON = function (filter) {
return JSON.parse(this, filter);
};

Answer 2

Quoting here:
"JSON2.js - Late last year Crockford quietly released a new version of his JSON API that replaced his existing API. The important difference was that it used a single base object."

Answer 3

I also noticed that json2 stringified arrays differently than json2007.
In json2007:
var array = [];
array[1] = "apple";
array[2] = "orange";
alert(array.toJSONString()); // Output: ["apple", "orange"].
In json2:
var array = [];
array[1] = "apple";
array[2] = "orange";
alert(JSON.stringify(array)); // Output: [null, "apple", "orange"].