Security utility
JWT Expiration Checker
Read a JWT exp claim and compare it with the current time.
● This tool runs entirely in your browser. Your input is never uploaded to our servers.
Output
Your result will appear here…
How to use JWT Expiration Checker
- Paste a JWT.
- Select Check Expiration to read the exp claim.
- Compare the result with your server's verified token validation.
Example
Input:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJ1c2VyLTEyMyIsImV4cCI6MTczNTY4OTYwMH0.signature
Output:
Expires at: 2025-01-01T00:00:00.000Z Status: Expired
Use cases
- Debug token expiry in development.
- Convert JWT exp seconds to a readable time.
- Check whether a test token is already expired.
About this tool
Read a JWT exp claim and compare it with the current time. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.
Frequently asked questions
Does this prove a token is valid?
No. It only reads exp from an unverified payload; the signature and other claims must be checked by a trusted server.
What time source is used?
The current clock on your device is used for comparison.
Is the token uploaded?
No. The token is decoded locally in your browser.