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Build an OAuth 2.0 Server

Implement an OAuth 2.0 authorization server: authorization code flow, PKCE for public clients, access + refresh tokens with rotation, scopes, redirect URI validation, state-based CSRF defense, and token introspection. The auth protocol behind 'Login with Google/GitHub/Facebook' and every B2B SaaS.

intermediate10 lessons4 chapters10 graded exercisesPython
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What you’ll have built

Chapter by chapter. Every step is a graded exercise.

  • OAuth Concepts
  • Authorization Code Flow
  • Tokens & Scopes
  • Production
Starts in Python — solve in the language you choose in the editor, same tests either way.

Curriculum

4 chapters, 10 lessons. Each lesson is a short read, one graded exercise, and a quiz.

  1. 1What is OAuth?Read · exercise · quiz
  2. 2Grant TypesRead · exercise · quiz
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