This course contains the use of artificial intelligence. Most Auth0 material stops at the moment the login button works. This one keeps going — through token validation, API authorization, the extensibility pipeline, B2B multi-tenancy, enterprise SSO, and the operational work that keeps an identity system alive once real customers depend on it.
You will follow one company the whole way. Halcyon Travel is a booking platform with two products: a consumer app used by travellers, and a corporate travel product sold to companies. They rolled their own authentication in year one — bcrypt, a users table, hand-signed tokens, a signing key nobody has dared rotate since 2021. It creaks. Then a 4,000-seat enterprise prospect makes SAML single sign-on a contract condition, and the whole thing has to be rebuilt properly. Every concept in the course arrives because Halcyon hits a problem that needs it.
What the course covers:
- Foundations — authentication vs authorization, where Auth0 sits in the identity landscape, tenants, application types, connections, and the two APIs you will live in
- OAuth 2.0 and OIDC properly — the authorization code flow step by step, PKCE and why public clients need it, client credentials, refresh token rotation, the flows you should never use, and the discovery and JWKS documents that make it all self-describing
- Universal Login in Next.js — wiring the Auth0 Next.js SDK v4 with its middleware-mounted routes, sessions and rolling cookies, protecting server components and server actions, federated logout, and branding the login page
