APIs
Decode a JSON Web Token to read its header and payload, including issued-at and expiration claims. Decoding does not verify that the token is authentic or secure.
Decoding a JWT does not verify that the token is authentic or secure. Signatures are not checked. Do not paste live production tokens if your policy forbids it — processing still happens locally.
A token with exp in the past is marked expired. A token with nbf in the future is marked not yet valid. Signature bytes are shown as present or missing — they are not validated.
Tokens never leave your browser. Do not paste production secrets into any online tool if your threat model forbids it; this decoder still processes data locally.
No. Decoding a JWT does not verify that the token is authentic or secure. Signature verification requires the correct secret or public key and must happen on a trusted server.
No. Base64url decoding runs in the browser. We recommend using sample or expired tokens when demonstrating the tool.
The tool highlights exp, iat, nbf, iss, aud, and sub when present. Other claims are shown as raw JSON.
Next step
Estimators and converters help you think. Delivery still needs contracts, environments, and an owner.