JSON - JavaScript Object Notation

http://en.wikipedia.org/wiki/JSON

An object in JSON format is always enclosed with curly braces "{ }"; and an array or a list of things/objects is always enclosed with square brackets. Strings are double quoted. Number is simply a number. Boolean is only 'true' or 'false'. Nil is 'null'.

And how to parse JSON formatted strings in Javascript can be learned from here:

http://www.json.org/js.html