All major browsers now include native JSON encoding/decoding.
// To encode an object (This produces a string)
var json_str = JSON.stringify(myobject);
// To decode (This produces an object)
var obj = JSON.parse(json_str);
Note that only valid JSON data will be encoded. For example:
var obj = {'foo': 1, 'bar': (function (x) { return x; })}
JSON.stringify(obj) // --> "{\"foo\":1}"
Valid JSON types are: objects, strings, numbers, arrays, true, false, and null.
Some JSON resources: