The token looks valid here but the server rejects it.

The verdict is computed against this device's clock. If it is wrong, so is the verdict — and the server reaches its own conclusion regardless. Signature failure and audience mismatch also produce rejections that have nothing to do with expiry.

There is no expiry claim.

Then the token declares no lifetime of its own. Whether it is still accepted depends entirely on the issuer, which may track revocation separately.

JWT Expiration Checker

Work out when a token expired, or how long it has left.

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About this tool

Reads the exp, nbf and iat claims and reports whether the token is currently within its validity window, in both absolute and relative terms.

Limitations

Comparisons use your device clock. If it has drifted, the answer drifts with it.
A token that has not expired can still be revoked, and this tool cannot know that.

Questions

The token looks valid here but the server rejects it.: The verdict is computed against this device's clock. If it is wrong, so is the verdict — and the server reaches its own conclusion regardless. Signature failure and audience mismatch also produce rejections that have nothing to do with expiry.
There is no expiry claim.: Then the token declares no lifetime of its own. Whether it is still accepted depends entirely on the issuer, which may track revocation separately.

Privacy

This page does its work in your browser. What you paste is processed by JavaScript running on your own device and is never sent to a DevToolery server — there is no server that could receive it. The page itself is a static file delivered by a CDN. See exactly what is stored.