jQuery looping .each() JSON key/value not working

I am having problems in looping the key/value of JSON by jQuery .each() function Initially I have a JSON like this: json = {"aaa":[ {"id":"1","data":"aaa1data"} ,{"id":"2","data":"aaa2data"} ], "bbb":[ {"id":"3","data":"bbb1data"} ] } And I would like to loop through all the key/value elements inside the JSON (aaa and bbb) and the retrieve the inner JSON arrays for looping again, so I tried $(json