[jQuery] using json in $.post

[jQuery] using json in $.post


hi,
I very new with json ( you may say that I still really don't
understand it quite well), how do I use the json object that is return
from the $.post in its callback argument?
$.post('/ap/item/code/edit/',
        values,
        function (data){
            //how to access the json object from the data?
        }
    );
the data is json object in particular is a dictionary
thanks
james