I'm searching a solution to get all the information/retrieve all data from the iTunes «App Store» and «Mac App Store» from Apple to a given App-ID … Is there a way to read out all the infos like App-Description, Price, Icon, Developer, Ratings etc. from the Stores?
Try using the iTunes Search API which will give you a nice JSON object representing the app. The lookup section is the one you are looking for:
https://affiliate.itunes.apple.com/resources/documentation/itunes-store-web-service-search-api
Example query for the Stack Overflow App: https://itunes.apple.com/lookup?id=1155618808
You can get all details from apple itunes using this url: https://itunes.apple.com/search?term=xxx&country=us&entity=software
Where you can get json object as result. So you can get all details of every app in apple itunes by decode the json object.
I think this url will help you.
To clarify what seems to be the state of affairs as of 23-May-2011:
Lookup by id, as in ChaosCoder's example, seems to work for the Mac App Store.
Searching does not work.
The type 'app' does not exist. Use 'Software'.
来源：https://stackoverflow.com/questions/5604886/how-to-get-info-from-the-apple-itunes-app-store-and-mac-app-store