JWT Debugger
Decode and analyze standard JSON Web Tokens (JWT) safely. Verify signature values locally without server transmission.
// Header structure will appear here...
// Claims payload structure will appear here...
Provide a valid encoded JWT in the input panel to inspect signatures.
Privacy Policy: Token decoding is executed directly in your browser. Unlike other JWT tools, we never store or transmit your tokens or secrets to external servers.
Frequently Asked Questions
What is a JSON Web Token (JWT)?
JWT is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
Are JWTs encrypted?
No, standard JWTs are usually signed but **not encrypted**. The payload is simply base64url encoded. Anyone who intercepts the token can read the user data claims inside it. Thus, you should never put sensitive data like passwords or credit card numbers in a JWT payload.