How OAuth 2.0 Works for Backend Developers
freeCodeCamp News
EDITOR BRIEF
The article explains OAuth 2.0 by starting with the problem it solves instead of memorizing terms and diagrams. It uses a Spring Boot trip-planning app that needs access to Google Calendar to show why the protocol exists, then outlines topics like roles, access tokens, scopes, authorization code flow, refresh tokens, PKCE, and common security pitfalls.
INSIGHTS
If you're learning backend auth, start from the problem: how an app gets limited access without taking a user’s password. Then build a small OAuth demo in Spring Boot and trace each redirect and token to see why it exists.
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