--- FIX: Port Already in Use (EADDRINUSE)address already in use ::3000 SOLUTION --> Kill the process on that port: //==== OPTION A ====== gloablly install ( not in project package.json npm install -g kill-port and then -->> kill-port 3000 // use your port //===== OPTION B ======= --- Windows --- netstat -ano | findstr :3000 taskkill /PID 17780 /F --- Linux / macOS --- lsof -i :3000 kill -9 17780 //Note Use your PID instead of 17780 ==============END ==========