JWT Claims Validator
Paste any JWT to decode and validate its standard claims without a secret. Checks: exp (expiry), iat (issued at), nbf (not before). Shows whether the token is currently valid, how old it is, and how long until expiry. Displays all claims in a readable table.
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Common Use Cases
- Debug expired JWT tokens in dev
- Check token validity during API troubleshooting
- Understand JWT claim structure
- Verify token timestamps without a backend
Frequently Asked Questions
Can this verify the JWT signature?
No — verifying the signature requires the secret or public key, which you should never paste into a browser tool. This validator checks only the time-based claims (exp, iat, nbf) which don't require the secret.
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Tool Info
CategorysecurityAI EnhancementNoData StorageZero retention