Facebook’s Access Token Tool and Access Token Debugger
Facebook provides an Access Token Tool, which issues access tokens that can be used for testing and debugging. Both user-based and app-based tokens are issued. The user tokens issued by the tool are similar to those issued by the server-side Web Application flow or client-side flow. The app tokens issued by the tool are similar to those issued by the Client Credentials flow.
They also provide an Access Token Debugger, which displays information about OAuth access tokens, including the scopes, validity, issue time, expiration time and more.
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