JWT Decoder
Decode and inspect JSON Web Tokens instantly — view header, payload, claims, and expiry status.
How to Use the JWT Decoder
- 1
Paste your JWT token
Paste a JSON Web Token into the input field, or click 'Load Sample' to try with an example token. The three parts (header, payload, signature) are color-coded automatically.
- 2
Inspect the decoded content
The header shows the algorithm and token type. The payload reveals all claims including user ID, roles, issuer, and any custom data embedded in the token.
- 3
Check token validity
The claims summary shows expiration time (exp), issued-at time (iat), and whether the token is currently valid or expired. All decoding happens in your browser — tokens are never sent to any server.
What is a JWT Decoder?
A JWT (JSON Web Token) decoder inspects the three parts of a token: the header (algorithm and token type), the payload (claims like user ID, roles, expiry), and the signature. Use this free tool to debug JWTs, inspect exp/iat timestamps, verify the algorithm, and check if a token has expired — all in your browser with no server-side processing.