Decode and inspect JWT tokens. View header, payload, and check expiration. Works entirely in your browser.
Decode and inspect JWT tokens instantly. View header, payload, and check expiration. Free and secure - runs entirely in your browser.
Paste your JWT into the input field. The tool splits the token into its three core components: Header, Payload, and Signature.
The Header and Payload are Base64URL encoded. We decode these segments back into human-readable JSON objects.
We automatically identify and format standard claims like 'exp' (Expiration) and 'iat' (Issued At) for easier debugging.
Inspect local storage or cookie tokens to verify user roles, permissions, and expiration times during development.
Quickly verify that your JWTs don't contain sensitive internal data that shouldn't be sent to the client side.
Ensure your backend services are issuing tokens with the correct algorithms and payload claims as per your security spec.
All processing happens directly in your browser. Your data never leaves your device — we don't upload, store, or have access to any of your content.
No server roundtrips means instant results. Once this page is loaded, the tool works even without an internet connection.
Yes. Processing is entirely client-side. Your token is never transmitted to our servers, making it safe for inspecting production JWTs during troubleshooting.
This tool is designed for decoding and inspection only. To verify a signature, you should use specialized libraries (like jsonwebtoken) in a secure backend environment.
The tool will display a clear 'EXPIRED' badge if the 'exp' claim in the payload represents a timestamp in the past.