JWT Decoder

JSON Web Token (JWT) is an open standard for securely transmitting information between parties as a JSON object. It consists of three parts: header (algorithm info), payload (claims/data), and signature (verification).

Standard claims include: iss (issuer), sub (subject), aud (audience), exp (expiration time), nbf (not before), iat (issued at), and jti (JWT ID). These are optional but commonly used for validation.

Yes! All decoding happens entirely in your browser. Your token is never sent to any server. However, never share production tokens publicly as they may contain sensitive information.