How to access JSON.parsed object in javascript

alert(temp["2222"].MId);

You can't use numeric indexing, because don't have any actual arrays. You can use dot syntax if the first character of the key is non-numeric. E.g.:

var temp = JSON.parse('{"n2222":{"MId":106607, "Title":"VIDEOCON Semi Automatic Marine 6.8kg", "Name":"washma01", }}');
alert(temp.n2222.MId);

Try this:

temp["2222"].MId

Typically temp.bar and temp["bar"] are equivalent JavaScript statements, but in this case one of your property name starts with a number. When this happens you are forced to use the index (aka bracket) notation.

You need to access the variable like so temp['2222']['MId'] , That will give you the value of MId. Even though I have shown using the [] method of getting the value , the answers below work as well.

You can run this test below in firebug.

var ss = {"2222":{"MId":106607, "Title":"VIDEOCON Semi Automatic Marine 6.8kg", "Name":"washma01"}};
console.log(ss['2222']['MId']);

when you have a good json formated object, but you don't know the key (here it look like an id) you can acces like this :

var keys = Object.keys(json_obj);
for (var i = 0; i < keys.length; i++) {
    console.log(keys[i]);
    console.log(json_obj[keys[i]].MId);
};