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.