Difference between Javascript Object and JSON Object

JSON is data interchange format like XML it is used to pass data from one application to another from server to client or from client to server, etc

Example would be that you can send value from ASP.Net C# and change it in JavaScript and again send back

Send and Receive json objects to Web Service Methods using jQuery AJAX in ASP.Net

While JavaScript is a Language and its objects is specifically for JavaScript only.

JSON

var json = {"Name": "Mudassar"};

It can store string, bool, int, array or objects. But it cannot store functions

JavaScript

var js = { a: 1, b:2 };
var a = js.a;

You can convert a JSON string to JavaScript object as

var json = {"Name": "Mudassar"};
var js = eval('(' + json + ')');

//Then you can use it as following in JavaScript
var name = js.Name;