About the JWT Decoder
Paste a JWT to read its header and claims, with timestamps (iat, exp, nbf) shown as dates and a clear expired / not expired status.
How does the JWT Decoder work?
A JSON Web Token has three parts separated by dots: a header, a payload and a signature. The header and payload are Base64URL-encoded JSON, so they can be read by anyone — decoding shows them as formatted JSON and turns timestamp claims (iat, nbf, exp) into dates.
Example
A payload of {"sub":"123","exp":1767225600} shows an expiry date of 1 January 2026 (UTC) and whether that is in the past.