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I guess parseJSON is obsolete, therefore the new version (json2) doesn’t even use it anymore.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);     };