JSON Web Tokens (JWT) are the standard for modern auth, but they are "opaque" by default. Our decoder lets you peak inside the payload to verify your claims without needing a secret key.
Debugging Auth Flows
When my login flow isn’t working, the first thing I do is paste the token into this decoder. I check the `exp` (expiration) and `scope` claims to ensure the token actually has the permissions it needs. It’s an essential part of my daily dev toolkit.
Client-Side Security
Never paste a production token into a site that sends data to a server. Our decoder uses **browser-based JavaScript** only. Your tokens never leave your local machine.