What is JSON Web Token (JWT)?

A JSON Web Token, or JWT, is a small, secure token used to share information between systems. It’s encoded as a JSON object and digitally signed, so the data inside can’t be changed without detection. In identity management, JWTs are often used for authentication and authorization. For example, after you log in, the system gives you a JWT that proves who you are and what you can access. They are a key part of OAuth 2.0 and OpenID Connect flows.