How to verify Facebook access token?

The officially supported method for this is:

GET graph.facebook.com/debug_token?
     input_token={token-to-inspect}
     &access_token={app-token-or-admin-token}

See the check token docs for more information.

An example response is:

{
    "data": {
        "app_id": 138483919580948, 
        "application": "Social Cafe", 
        "expires_at": 1352419328, 
        "is_valid": true, 
        "issued_at": 1347235328, 
        "metadata": {
            "sso": "iphone-safari"
        }, 
        "scopes": [
            "email", 
            "publish_actions"
        ], 
        "user_id": 1207059
    }
}

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