JWT Expiry Checker
Check if your JWT token is expired, see remaining validity with a live countdown, and view the full token lifespan. Process data securely in your.
What is JWT Expiry Checker | Rune
JWT Expiry Checker is a specialized tool focused on token expiration analysis. Paste any JWT and instantly see whether it's valid, expired, or expiring soon. Features a live countdown timer showing remaining validity, a lifespan progress bar, and detailed time claims (iat, exp, nbf) in your local timezone.
The tool also shows issuer, subject, and algorithm information. Ideal for developers debugging authentication issues, monitoring token lifecycles, or verifying API token validity. Implements industry-standard cryptographic algorithms and security protocols for reliable results. All security operations run locally in your browser, ensuring sensitive data never leaves your device.
Key Features of JWT Expiry Checker
Everything you need for professional jwt expiry checker
Live Countdown
Real-time countdown showing exactly how much time remains before your token expires, updating every second.
Lifespan Progress
Visual progress bar showing what percentage of the token's total lifespan has elapsed with color-coded urgency.
Expiry Warnings
Automatic detection of expired tokens and soon-to-expire tokens (less than 10% remaining) with clear visual alerts.
Time Claims
Human-readable display of issued at (iat), expires at (exp), and not before (nbf) claims in your timezone.
Token Metadata
Shows signing algorithm, issuer, and subject claims alongside expiry information for context.
Privacy Safe
All analysis runs in your browser. Your JWT tokens are never sent to any server or stored.
How to Use JWT Expiry Checker
Follow these simple steps to get started
Paste Token
Copy your JWT token and paste it into the input field. Analysis starts automatically.
Check Status
Instantly see if the token is valid, expired, or expiring soon with a clear status banner.
Monitor Countdown
Watch the live countdown timer and lifespan progress bar for real-time expiry tracking.
Pro Tips
- Tokens showing 'Expiring Soon' (90%+ elapsed) should be refreshed before making API calls.
- If your token has no 'exp' claim, it never expires, which can be a security risk in production.
- The lifespan progress bar helps you understand your token refresh strategy timing.
- Bookmark this tool for quick token debugging during API development and testing.
Explore More Tools
Discover other powerful tools to boost your productivity
Frequently Asked Questions
Everything you need to know about JWT Expiry Checker
How does the live countdown work?
The countdown updates every second by comparing the current time to the token's exp (expiration) claim. It shows days, hours, minutes, and seconds remaining.
What does 'Expiring Soon' mean?
A token is flagged as 'Expiring Soon' when more than 90% of its total lifespan has elapsed. This is a warning to refresh the token before it expires.
Can I check tokens without an exp claim?
Yes. The tool will show 'No Expiration' status and display other available claims. Tokens without exp never expire.
Is my token safe?
Yes. All analysis happens entirely in your browser. No tokens are transmitted to any server or stored anywhere.
What is the lifespan progress bar?
It shows what percentage of the token's life has elapsed, calculated from iat (issued at) to exp (expiration). Green means fresh, yellow means aging, red means almost expired.
Why does my token show as expired?
The current time has passed the exp (expiration) timestamp in the token. You'll need a new token from your authentication server.
Is this tool free?
Yes, completely free with no limits. Check as many tokens as you want without signing up.
Can I use this for debugging authentication issues?
Yes. This tool is ideal for debugging 401 errors caused by expired tokens, checking token refresh timing, and verifying token lifespans.
Still need help?
Can't find what you're looking for? Our support team is here to assist you.
Contact Support