JWT Decoder
Free online JWT decoder and debugger. Decode, inspect, and verify JWT tokens with support for multiple algorithms.
Frequently Asked Questions
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.
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.
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.