OAuth and Third-Party Login — Google, GitHub, Apple Sign-In
Understand how OAuth works, why it exists, and how to add Google, GitHub, and Apple sign-in to your app.
"Sign in with Google." You've clicked that button hundreds of times. It's so seamless that you probably never stopped to think about what's actually happening behind the scenes.
But if you're building an app, you need to understand it — because adding third-party login is one of the highest-impact features you can implement. It reduces sign-up friction dramatically. Users don't need to create yet another password. And you get verified email addresses for free.
The protocol that makes this all work is called OAuth 2.0, and it's both simpler and more nuanced than most people think.
The Problem OAuth Solves
Imagine you're building an app and you want to access a user's GitHub repositories. Without OAuth, you'd have to ask the user for their GitHub username and password. That's ter
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