JWT Time Decoder
Paste a JWT to see when it was issued, when it becomes valid, and exactly how long until it expires — counting down live. Decoding happens entirely in your browser; the token is never uploaded. (Signatures are not verified — this is a debugging tool, not a validator.)
The time claims, briefly
| Claim | Meaning | RFC 7519 |
|---|---|---|
| exp | Expiration — the token must be rejected on or after this time | §4.1.4 |
| nbf | Not before — the token must be rejected before this time | §4.1.5 |
| iat | Issued at — when the token was created | §4.1.6 |
All three are NumericDate values: seconds (not milliseconds!) since the Unix epoch. Accidentally writing
milliseconds into exp creates tokens that expire in the year 56000 — this tool will flag that.