Genlyworks

Welcome to the Genlyworks JWT Debugger. Working with API authentication? Simply paste your JSON Web Token string to instantly decode and inspect its contents. Verify signatures, view claims, and check expiration times directly in your browser without compromising security.
JWT Debugger
Status Waiting for input
What is a JWT Debugger?

A JWT (JSON Web Token) is an open standard (RFC 7519) used securely transmitting information between parties as a JSON object. This tool helps developers visualize the three parts of a token: the Header, the Payload (Claims), and the Signature. It transforms the encoded Base64Url string into a human-readable format, making it essential for debugging authentication flows in web and mobile apps.

Why use this tool?

  • Inspect Claims: Quickly verify if your token contains the correct user data (e.g., user ID, roles, email) without digging into backend logs.

  • Check Expiration: Easily convert the exp (expiration) and iat (issued at) timestamps into readable dates to see if a token is still valid.

  • Verify Signatures: Ensure the integrity of the token by verifying the signature using your secret key or public/private key pairs (HMAC, RSA, or ECDSA).

Client-Side Security Security is critical when handling authentication tokens. Genlyworks JWT Debugger is built with privacy in mind.

  • 100% Browser-Based: The decoding and verification logic runs entirely in your web browser using JavaScript.

  • No Server Uploads: Your tokens and secret keys are never sent to our servers. They stay on your device, ensuring your sensitive data remains private.

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