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JWT Decoder for Firebase Auth Tokens

Quick Answer: Paste a Firebase Auth ID token to see Firebase-specific claims: user_id, auth_time, firebase.identities (linked providers), firebase.sign_in_provider, and any custom claims set via admin SDK.

FAQ

What claims are in a Firebase ID token?

Standard: iss (project), sub (uid), aud (project), iat, exp, auth_time. Firebase-specific: firebase.identities, firebase.sign_in_provider, and custom claims you set.

How long are Firebase ID tokens valid?

Firebase ID tokens expire after 1 hour. The Firebase SDK automatically refreshes them using the refresh token. Always verify tokens server-side for security.

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