JWT Decoder

Paste any JWT token and instantly see its decoded header, payload, and metadata. Common claims (iss, sub, aud, exp, nbf, iat, jti) are surfaced with human-readable labels, epoch timestamps are converted to UTC dates, and expiration status is shown in real time.

Includes algorithm detection, alg=none warning, raw encoded parts display, and copy buttons throughout. This is a decoder only — signature verification is not performed. Everything runs client-side — nothing is sent to a server.