A fast and secure JSON parser in JavaScript

This JSON parser does not attempt to validate the JSON, so may return a surprising result given a syntactically invalid input, but it does not use eval so is deterministic and is guaranteed not to modify any object other than its return value.

There are a number of JSON parsers in JavaScript at RFC 4627.

Once it is loaded, you can use parsed JSON as you would any other JavaScript object:

var myJson = '{ "x": "Hello, World!", "y": [1, 2, 3] }';
var myJsonObj = jsonParse(myJson);
alert(myJsonObj.x);  / alerts Hello, World!
for (var k in myJsonObj) {
  / alerts x=Hello, World!  and  y=1,2,3
  alert(k + '=' + myJsonObj[k]);
}

The jsonParse function takes an optional reviver function as specified at http://www.json.org/js.html so it should behave identically to the JSON.parse specified in the EcmaScript 5 draft.