Fix req.user TypeScript Error in Express | Global Types + JWT Auth Setup (No More Errors)

Getting the req.user TypeScript error in Express can be frustrating — especially when working with JWT authentication. In this video, I show you the correct production way to fix it using Global Type Declaration in Express + TypeScript, so you never run into req.user does not exist again. We go step-by-step and build a clean setup used in real backend systems: Why req.user throws TypeScript errors? How Express Request typing actually works? Creating global Express type augmentation (.d.ts) Properly defining req.user for JWT auth Making everything fully type-safe (no more hacks or any) By the end, your Express app will correctly recognize req.user everywhere — clean, scalable, and production-ready. ⚠️ Most tutorials do this the wrong way… this is the proper approach used in real backend architecture. If you’re building serious Node.js apps with authentication, this will save you hours of confusion. 👍 Like the video if it helped 💬 Comment if you want JWT auth full system (login + refresh token + roles) 🚀 Subscribe for more Node.js + TypeScript backend mastery