JWT Decoder
Decode and inspect JSON Web Tokens — header, payload, and expiry — instantly in your browser. Your token never leaves your device.
100% In-Browser Processing. Your files never leave your device.
JWT Token
Decoder only — signature not verifiedA JWT (JSON Web Token) is a compact, URL-safe token format used to securely transmit claims between parties. JWTs consist of three Base64URL-encoded parts separated by dots: a header (specifying the algorithm), a payload (containing the claims such as user ID, roles, and expiry time), and a signature (for verifying authenticity). While the signature must be verified with a secret key, the header and payload are simply Base64-encoded and can be decoded by anyone who has the token. A JWT decoder reveals the contents of the payload without requiring the secret key.