From Zero to Platform: Build Your Own GitHub-Level Login System with NextAuth and Casdoor

Many developers are puzzled by the complexity of modern authentication: why not just add a password column to the user table? This article demystifies the process, starting with understanding NextAuth Providers, delving into the necessity of OAuth 2.0, and providing a step-by-step guide on how to evolve from a simple self-hosted auth service to a unified identity platform like GitHub or Google using Casdoor, allowing multiple third-party apps to connect.