JWT Decoder
Decode and inspect JSON Web Tokens instantly.
What is a JWT Decoder?
A JWT (JSON Web Token) decoder parses the three parts of a JWT — the header, payload, and signature — and displays the decoded JSON content. JWTs are commonly used for authentication and authorization in web applications. This tool lets you inspect token contents without needing a secret key.
How to Use
- Paste your JWT token into the input field.
- The header and payload are decoded and displayed automatically.
- Check the expiration status badge to see if the token is still valid.
Frequently Asked Questions
Does this tool verify the JWT signature?
No, this tool only decodes the header and payload portions of the JWT. Signature verification requires the secret key or public key used to sign the token. This tool is designed for inspection and debugging purposes, not for security validation. Always verify signatures server-side in production.
Is it safe to paste my JWT here?
Yes, all decoding happens entirely in your browser using JavaScript. Your token is never sent to any server or stored anywhere. However, be aware that JWTs often contain sensitive information like user IDs and permissions. Avoid sharing your decoded token contents with others unless necessary.
What does the expiration status mean?
If the JWT payload contains an "exp" (expiration) claim, the tool compares that timestamp to the current time. A "valid" badge means the token has not yet expired, while an "expired" badge means the expiration time has passed. Note that an unexpired token may still be invalid for other reasons such as revocation.
