How to validate a Facebook application existence?

I'm currently building a Facebook integration program, and I wanted to know if it is possible to verify the existence of Facebook application开发者_StackOverflow中文版 by either with or without the Facebook API.

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Just call the Facebook graph api by accessing the app's name or id: http://graph.facebook.com/appId or http://graph.facebook.com/appName

If you are trying to search for apps, you could scrape this url: https://www.facebook.com/search.php?q=appNameSearch&type=apps