For addition definitions of Auth0-related terms, please see the Auth0 Identity Glossary. Identity Glossary Protocols Which authentication and authorization protocols Auth0 supports and how they work. Tokens Learn about the numerous types of tokens referenced in Auth0 documentation, what each is used for and how to use it. JSON Web Tokens (JWT) in Auth0 JSON Web Token (JWT) is an open standard that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This article introduces you to all of the concepts needed to fully understand JWTs.