Decode and inspect JSON Web Tokens. View header, payload, and signature with color-coded sections. Check token expiration instantly.
A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: a header (algorithm and type), a payload (claims/data), and a signature.
This tool decodes and displays the JWT contents but does not verify the cryptographic signature, as that requires the secret key or public key. It is a decoder/inspector, not a validator.
Yes. This tool runs entirely in your browser. No token data is sent to any server. However, you should never share JWTs publicly as they may contain sensitive information.
Paste your JWT and the tool will automatically check the "exp" claim in the payload. It will show whether the token is still valid or has expired, along with the exact expiration date and time.