How does Auth0 work? With the help of Auth0, you don't need to be an expert on identity protocols, such as OAuth 2.0 or OpenID Connect, to understand how to secure your web application stack. You first integrate your application with Auth0. Your application will then redirect users to an Auth0 customizable login page when they need to log in. Once your users log in successfully, Auth0 takes them back to your app, returning JSON Web Tokens (JWTs) with their authentication and user information.