JWT Debugger

Decode JWTs and inspect header, payload, and signature parts locally in the browser. It is useful for debugging tokens from APIs, auth systems, gateways, and local development environments.

You can read claim values, expiration fields, algorithms, and related metadata. For HMAC-signed tokens (such as HS256), you can verify locally when you supply the shared secret without sending the token to a third-party service.

Use it when a token looks malformed, a claim seems wrong, a signature check fails, or you need to compare encoded output while editing claims or headers.

Because JWTs often contain sensitive identifiers, keeping the decode and inspection flow local is important for internal systems and staging environments.