JWT Decoder
NewDecode JWT tokens to inspect header and payload, with optional HMAC signature verification
About JWT Decoder
JWT Decoder allows web developers to decode JSON Web Token (JWT) headers, claims, and payload data without sending security tokens over the internet.
Inspect token expiration times (exp), issuer details (iss), user roles, and claim structures safely within your local browser sandbox.
Privacy & Data Security
JWT Decoder processes all operations 100% locally in your web browser memory. Your files, text snippets, and generated outputs are never stored, logged, or uploaded to any remote server.
Frequently Asked Questions
Yes. SajiloTools decodes JWTs entirely on your local browser instance. Your secret keys and authorization tokens are never sent to external servers.
Decoding displays the token's header and payload. Optional HMAC signature verification can be tested if you supply your secret key locally.
Yes, claims like `exp`, `iat`, and `nbf` are automatically converted into human-readable local dates and expiration status indicators.
The decoder parses standard JWT headers specifying HS256, RS256, ES256, and generic JOSE headers.