JWT Decoder Online: Inspect JSON Web Tokens Without a Library
When something goes wrong with authentication in your app, the first thing you want to do is look inside the JWT. What claims does it contain? Is it expired? What audience is it issued for? Does th...
Source: DEV Community
When something goes wrong with authentication in your app, the first thing you want to do is look inside the JWT. What claims does it contain? Is it expired? What audience is it issued for? Does the user have the right roles? The problem: JWT tokens look like random garbage to the naked eye. eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c That's a JWT. It contains structured data — but it's Base64-encoded in a format designed for transmission, not readability. You could decode it with a one-liner in a terminal, but when you're in the middle of debugging an auth issue, you want something faster. This guide explains what JWTs are, how they work, what's inside them, and how to use a JWT decoder to debug authentication problems quickly. What Is a JWT? A JSON Web Token (JWT, pronounced "jot") is an open standard (RFC 7519) for securely transmitting information between parties as a JSO
