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JWT Decoder for Firebase

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Firebase tokens contain user identity and custom claims. Decode locally.

Example

[Paste your Firebase ID token here]
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Tips

  1. 1Expires after 1 hour.
  2. 2sign_in_provider shows auth method.
  3. 3Custom claims as top-level keys.

Frequently Asked Questions

Expired?

1h TTL. Use getIdToken(true) to refresh.

Custom claims?

Set via admin SDK. Top-level payload keys.

Admin tokens?

Also JWTs. Same decoding.