JWT Decoder
Decode JWT tokens locally and inspect Header, Payload, and expiration claims.
How it works
Paste a complete JWT token to instantly view the three parts that compose it: the Header, the Payload (Claims), and the Signature, all formatted in readable JSON.
Frequently asked questions
What is a JWT token?
JSON Web Token (JWT) is an open standard used to share authentication and general data between a client and a server in a compact, secure format.
Is it safe to paste my JWT tokens into this tool?
Yes. Decoding runs 100% locally in your browser. The token data is never transmitted over the internet, ensuring your credentials and sessions remain confidential.
Why is the signature not validated here?
Validating a JWT signature requires a private secret key or public key. Since this is a generic client-side utility, we only decode the structural content for inspection.