OAuth 2.0 Explained Like Never Before | MERN Stack Series #8

This is Video 8 of the REST API Mastery series — where I finally clear up the topic that confuses 90% of MERN students: OAuth 2.0. You use "Login with Google" every single day — but do you actually know what happens behind the scenes? In this video, I cover: ✅ Why OAuth is NOT a login system (it's authorization, not authentication) ✅ The Valet Key analogy that makes OAuth click instantly ✅ The 4 roles in OAuth — explained with a real "Login with Google" example ✅ OAuth vs JWT — the difference every interviewer asks ✅ How they actually work TOGETHER in real apps 📄 Free easy-English handwritten-style PDF notes for this video are linked below — perfect for quick revision before interviews. 🎯 What's covered in this series: 1. REST API Basics 2. HTTP Methods & Status Codes 3. Core REST Principles 4. Security Basics 5. HTTP Request & Response 6. JWT Authentication 7. Access Token & Refresh Token 8. OAuth 2.0 (this video) 9. Rate Limiting 10. REST API Best Practices 11. Testing & Documentation 👉 Perfect for BCA / MERN stack students preparing for backend placements. 🔔 Subscribe and turn on notifications so you don't miss any video in this series. 💬 Comment your doubts — I reply to every comment. — 📂 Free PDF Notes: [] 📂 Full Playlist: [] 📂 Watch Video 7 (Access Token & Refresh Token): [] #RESTAPI #MERNStack #OAuth #BackendDeveloper #WebDevelopment #CodingInterview #PlacementPreparation #JavaScript #NodeJS #ExpressJS #MongoDB #ReactJS #TechInterview #CodeWithHardeep #ComputerScience