JWT Expiration Checker
JWT Expiration Checker
Decode JWT header/payload locally and inspect exp/iat timing without signature verification.
Privacy
Processed locally in your browser. We do not store or upload your data.
File input
Choose a file
Click, drop, or paste from clipboard.
Security note
Decoded JWT content is not verified unless signature verification is explicitly performed.
Result
Ready to inspect token expiration.
Do not paste production secrets or private keys into web tools.
Flow
- Decode JWT header and payload without signature verification.
- Read exp, iat, and nbf claim timestamps.
- Compute seconds until expiry based on local current time.
Example
Worked example: token with exp claim
- 1 Paste JWT containing exp and iat claims.
- 2 Tool decodes payload and extracts numeric timestamps.
- 3 Status shows expires in N seconds or expired N seconds ago.
You get a clear expiry status without manual timestamp math.
How
- Paste JWT token text in the input area.
- Run checker to decode claims and compute expiry delta.
- Review status summary and structured timing output.
Cases
- Diagnose expired bearer tokens in API calls.
- Verify issued-at and expiration windows in auth servers.
- Document token-lifetime behavior in integration notes.
Avoid
- Assuming decoded payload implies signature validity.
- Ignoring local clock skew when evaluating expiration.
- Pasting production secrets or private keys into browser tools.
FAQ
Does this verify JWT signatures?
No, this tool decodes and inspects claims only; signature verification is not performed.
Can it show token expiry status?
Yes, it computes remaining or elapsed seconds from the exp claim.
Is token processing local?
Yes, token decoding and claim inspection run locally in your browser.
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