JWT Decoder

This JWT decoder reads the header and payload of any JSON Web Token and pretty-prints the claims so you can inspect them at a glance. Standard time claims like exp, iat, and nbf are shown as human-readable dates, and a badge tells you immediately whether the token is valid or expired.

Decoding happens entirely in your browser - your token is never sent anywhere, which matters because JWTs often carry sensitive session data. Note that this tool decodes only; it does not verify the signature, since verification requires the signing secret or public key. Use it to debug auth flows, check expiry, and confirm exactly what a token contains.