Authentication Middleware Deep Dive | Change Password API 🔐

In this lecture of the Mega Backend Project, we build a secure Change Password API using JWT authentication with Access Tokens and Refresh Tokens, protected by a custom Auth Middleware. You will learn: ✅ How Auth Middleware works using Access Token ✅ Secure Change Password API flow ✅ Validate old password before updating ✅ Hash new password securely ✅ Handle authentication using JWT ✅ Use Access Token & Refresh Token correctly ✅ Real-world password update strategy ✅ Testing Change Password API step by step This lecture is perfect for: ✔ Backend developers ✔ Node.js & Express learners ✔ MERN stack students ✔ Authentication & security learners ✔ Interview preparation (JWT & middleware) 0:00 Introduction | Change Password API (JWT Auth) 0:11 Change Password Flow Explained 4:35 Change Password Business Logic 7:27 Authentication Middleware Flow (Access Token) 14:12 Client Request for Change Password API 17:29 Auth Middleware Logic Explained 24:14 Change Password API Implementation 36:24 Complete Revision & Key Takeaways #ChangePassword #JWT #AuthMiddleware #AccessToken #RefreshToken #BackendDevelopment #NodeJS #ExpressJS #mongodb #WebDevelopment 📌 Previous Lecture: Login API with Access & Refresh Tokens 📌 Next Lecture: Reset Password Api 👍 Like, Share & Subscribe for real-world backend system design.