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Decode, verify, and analyze your JSON Web Tokens (JWT) in real-time. Our tool breaks down your token into Header and Payload sections, providing human-readable insights while ensuring 100% privacy by processing everything locally in your browser.
A JSON Web Token (JWT) consists of three parts separated by dots: Header, Payload, and Signature. Our debugger takes your encoded string and uses Base64 decoding to reveal the JSON data hidden within the first two parts. This allows you to inspect claims, verify user permissions, and debug authentication flows instantly.
Security is paramount when handling authentication tokens. Unlike many other online tools, the Utilexa JWT Debugger never sends your token to a server. All processing happens within your browser's memory, ensuring that sensitive data like user IDs, roles, and session info remains strictly private and secure.
The Payload contains "claims" which are statements about an entity (typically, the user) and additional data. Our tool automatically identifies common claims like exp (expiration time), iat (issued at), and sub (subject), helping you troubleshoot token expiration issues or unauthorized access errors in seconds.
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Yes, absolutely. Our JWT Debugger is a client-side tool. This means the token you paste is decoded directly in your browser using JavaScript. No data is transmitted to our servers or stored anywhere.
This tool is primarily designed for decoding and inspecting the contents of the Header and Payload. For security reasons, signature verification usually requires a server-side secret key, which should never be shared with any online tool.
A standard JWT must have three parts separated by two dots (.). If your input is missing a part, has incorrect characters, or isn't Base64 encoded, the debugger will notify you of an invalid structure.
'exp' stands for Expiration Time, indicating when the token should no longer be accepted. 'iat' stands for Issued At, indicating when the token was created. Our tool converts these Unix timestamps into readable dates for you.