JWT Expiration Checker
Check whether a JWT is expired, when it expires, and its full validity window — locally, without verifying or transmitting the token.
Processed locally in your browser — nothing is uploaded.
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Decoding does not verify the signature. Anyone can create a token with any contents — a decoded JWT proves nothing about who issued it or whether it was tampered with. Always verify signatures server-side before trusting claims.
About JWT Expiration Checker
Paste a JWT and instantly see whether it is expired, how long until it expires (or how long ago it did), and its complete validity window from the iat, nbf, and exp claims.
This checks timestamps only. It does not verify the signature, so a token that looks valid here may still be rejected by a server — and a forged token can claim any expiry it likes.
Common uses
- Debug 401 errors caused by expired access tokens
- Check how much lifetime a freshly issued token has
- Verify that refresh logic issues tokens with the expected TTL
Limitations
- Signature is NOT verified — expiry math says nothing about authenticity
- Tokens without an exp claim never expire by RFC 7519; the tool tells you when that's the case