JWT Decoder FAQ

Q: What is a JWT token?

JWT (JSON Web Token) is a compact, URL-safe token format used for authentication and information exchange. It consists of three parts: Header, Payload, and Signature.

Q: How do I verify a JWT signature?

Paste your JWT token, enter the secret or public key, select the algorithm, and click "Verify." The tool will tell you if the signature is valid.

Q: What do exp, iat, and nbf mean?

These are standard JWT claims: exp (expiration time), iat (issued at), and nbf (not before). Our tool automatically converts timestamps to human-readable dates.