Professional JWT Debugger & Decoder Online
Inspect and validate JSON Web Tokens instantly. No data ever leaves your device.
What is a JWT Decoder?
A JSON Web Token (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. A JWT decoder online allows developers to inspect the header, payload, and signature of a token to verify its contents and expiration. Tokens are typically used for authentication and information exchange in modern web applications. Understanding the claims inside a token is essential for debugging authorization issues and ensuring that your API integration is functioning correctly.
When should you use a JWT Debugger?
Developers use a JWT debugger tool during the development and testing of applications that use OAuth2 or OIDC for authentication. If your application is rejecting a token or if you need to verify that a token contains the correct user permissions, this browser-based tool provides an instant view of the encoded data. Unlike other debuggers that send your sensitive tokens to a backend for decoding, Cipherly processes the JWT entirely in your local memory. This ensures that no data stored on our servers, keeping your authentication tokens private and secure throughout your debugging session.