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Find clear answers to common questions about JWT Expiry Checker, including usage, output, and common issues.
Use this free JWT Expiry Checker to see whether a JSON Web Token is expired, still valid, or close to expiring. It is useful for debugging authentication issues, failed API requests, session problems, and token refresh logic. Paste a JWT token to inspect expiration-related claims such as exp and iat, understand token timing, and confirm whether time-based auth issues are causing the problem.
JWT Expiry Checker is built for development, debugging, formatting, and quick technical checks directly in the browser.
A JWT expiry checker reads token timing claims such as exp and helps you see whether the token appears expired or still valid.
JWT Expiry Checker focuses on time-based token status, while JWT Decoder gives a broader view of the header and payload.
If the token includes an exp claim, the checker can compare that timestamp with the current time to determine whether it has expired.
exp is the expiration timestamp that indicates when the token should no longer be accepted.
iat usually stands for issued at and shows when the token was created.
A JWT can decode successfully and still fail because it is expired, issued for the wrong audience, or otherwise not valid for the current request.
Yes. A token may parse and decode correctly but still be expired or fail signature or audience checks.
If there is no exp claim, the checker cannot determine expiration directly from the token payload.
No. Expiry checking only looks at timing claims. Signature validation is separate.
Use JWT Parser or JWT Decoder when you want broader token inspection, not just expiration and timing details.
JWT Expiry Checker is built for development, debugging, formatting, and quick technical checks directly in the browser.
Start by checking the input format, removing accidental spaces or unsupported characters, and comparing your input against the example pattern on the page.
Fix: Expired and invalid are not always the same. A token can be well-formed but no longer usable because of time-based claims.
Fix: Compare token timestamps carefully and confirm system time is correct where the token is being used.
Fix: Expiry checking focuses on timing claims. Signature validation is a separate step.
Fix: Paste the full JWT so the payload can be read correctly.
Fix: iat usually shows when the token was issued, while exp shows when it should expire.
If you want to see realistic input and output patterns, open the examples page. If you want step-by-step usage guidance, open the guide page.
Open the main JWT Expiry Checker page to test your own input and generate a live result.