JWT Expiry Checker
Check if a JWT token is expired or still valid.
About JWT Expiry Checker
JWT Expiry Checker reads the exp (expiry) and iat (issued at) claims from a JWT and tells you whether the token is currently valid, how long until it expires, or how long ago it expired. This is a quick diagnostic when you see 401 Unauthorized responses and suspect a stale token. It also shows the nbf (not before) claim if present.
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Frequently Asked Questions
Is JWT Expiry Checker free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
What if the token has no exp claim?
If no exp claim is present the token does not have a built-in expiry. The tool will report that no expiry was found and the token does not expire on its own.
Does the tool account for clock skew?
The expiry is compared against your browser clock. A small leeway option (default 0 seconds) can be configured to account for clock skew between your machine and the server.