Get the json from url and want to access the google app store

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JSON

google-app

Hi,
I need to retrive this json which is placed on this http://itunes.apple.com/rss/customerreviews/id=338010821/json through ajax hit .

1. Can i do this ?
2. i wrote this code. is that correct ?

$.getJSON("http://itunes.apple.com/rss/customerreviews/id=338010821/json", { format: "json" }).done(function (data) {
                $.each(data.items, function (i, item) {
                    debugger;
                    var dd = item;
                });
            });

Actually,
I need to get the google api key for play store so that i can show the KPI's trend?