Check JWT expiry

Check whether a JWT expiration timestamp has passed.

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ToolJWT Expiry Checker
Input
Output
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Preview

How it works

The JWT payload is decoded and its NumericDate expiration claim is compared with a selected current time, optionally accounting for a clock-skew tolerance. The check is local and does not validate the signature, issuer, audience, or revocation state.

  • NumericDate uses seconds since the Unix epoch; skew handles imperfect clocks.

Worked example

Check expired JWT with iat and exp claims
Inspect a JWT from January 2018 to see its expiry status and timestamps
Input
											eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2VyLTEyMyIsImV4cCI6MTUxNjIzOTAyMiwiaWF0IjoxNTE2MjM4OTIyfQ.abc123
Output
												Issued At: 2018-01-18T01:28:42.000Z
Expires At: 2018-01-18T01:30:22.000Z
  Status: EXPIRED (Expired 3141d 11h 14m 53s ago)

When to use this

Frontend diagnostics, gateway prechecks, and near-expiry test fixtures inspect JWT dates.

Edge cases

  • A missing expiration claim is not the same as an unexpired token.
  • Milliseconds interpreted as seconds produce a date thousands of years away.
  • A valid future expiry does not make an unsigned token trustworthy.

References