Decode JWT headers and payloads and inspect exp, iat and nbf in UTC and Japan time.
Inputs are processed in your browser. This tool does not send or store them on a server.
Paste a compact three-part JWS token and select Analyze. Encrypted JWE tokens are unsupported. Time checks use your device clock.
Decoding does not establish trust. Signatures, issuers and audiences are not verified. exp is expiration, iat is issuance and nbf is the earliest use time. No private key is needed.
Yuru Tech Note explains the underlying formats and protocols with examples.