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Have you ever logged into a third-party app using Google or GitHub and wondered how that actually works? That magical flow that lets you skip creating a new password and instantly access an app? That’s OAuth2 in action. In this post, I’ll walk you through: What OAuth2 is Why it came to be What problems it solves A full-stack OAuth2 demo using Spring Boot and React The Problem Before OAuth Before OAuth, if an app needed access to your account on another platform (like Google or Facebook), you had to give them your actual password.

Apr 23, 2025 - 05:36
 0

Have you ever logged into a third-party app using Google or GitHub and wondered how that actually works? That magical flow that lets you skip creating a new password and instantly access an app? That’s OAuth2 in action.

In this post, I’ll walk you through:

  • What OAuth2 is
  • Why it came to be
  • What problems it solves
  • A full-stack OAuth2 demo using Spring Boot and React

The Problem Before OAuth

Before OAuth, if an app needed access to your account on another platform (like Google or Facebook), you had to give them your actual password.

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