JWT Decoder & Expiry Checker
Free online tool to decode JWT tokens and check expiration with live countdown with timezone support and real-time updates.
👆 Paste a JWT token above to decode it
We'll show you the header, payload, and expiration status
Decode JWT
Instantly decode JWT tokens to view header and payload in readable JSON format.
Live Countdown
Real-time countdown showing exactly when your token expires with timezone support.
Privacy First
All decoding happens in your browser. Your tokens never leave your device.
How to Use
Paste Your JWT Token
Copy your JWT token from your application and paste it into the input field above.
View Decoded Data
See the header and payload decoded into readable JSON format with syntax highlighting.
Check Expiration
Watch the live countdown to see exactly when your token expires, with visual indicators for expired or expiring-soon tokens.
Frequently Asked Questions
What is a JWT token?
JWT (JSON Web Token) is a compact, URL-safe means of representing claims to be transferred between two parties. It's commonly used for authentication and authorization in web applications.
Is it safe to paste my JWT here?
Yes! All decoding happens entirely in your browser using JavaScript. Your tokens are never sent to any server or stored anywhere. This tool is completely client-side and privacy-focused.
Can I use this tool offline?
Once the page is loaded, yes! All the decoding logic runs in your browser, so you can use it even without an internet connection.
Open Source
This tool is open-source and available on GitHub. Feel free to contribute, report issues, or use it in your own projects.
View on GitHub →