JWT Decoder: Secure & Local

A JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. They are most commonly used for authorization and information exchange.

A typical JWT looks like xxxxx.yyyyy.zzzzz and consists of three parts:

• Header: Contains metadata about the token, such as the signing algorithm (e.g., HMAC SHA256 or RSA).
• Payload: Contains the claims—statements about an entity (typically, the user) and additional data.
• Signature: Used to verify that the sender of the JWT is who it says it is and to ensure that the message wasn't changed along the way.

Note: Our tool decodes the Header and Payload for inspection but does not verify the Signature. To verify a signature, you must possess the secret key or public key on your backend.