This tool can find the app details behind a given Google Client ID (such as 12345.apps.googleusercontent.com).
Google now requires a browser User-Agent header to return app details. CORS proxies strip this header, preventing the tool from working.
Workaround: Use curl with the proper headers: curl -H "User-Agent: Mozilla/5.0" "https://accounts.google.com/signin/oauth/error?client_id=YOUR_CLIENT_ID&flowName=GeneralOAuthFlow"
Just curious? .
This tool is open-source, and the code is available on GitHub.