Node.js Important packages
| S. No. | Package | Use in Project Running | Install Command |
| 1 | Express.js | Create server and run API | npm install express |
| 2 | Nodemon | Auto restart server after changes | npm install nodemon --save-dev |
| 3 | dotenv | Load .env variables | npm install dotenv |
| 4 | CORS | Connect frontend and backend | npm install cors |
| 5 | Morgan | Show request logs in terminal | npm install morgan |
| 6 | Helmet | Add security to app | npm install helmet |
| 7 | Body Parser | Read form and JSON data | npm install body-parser |
| 8 | Cookie Parser | Read browser cookies | npm install cookie-parser |
| 9 | PM2 | Run app continuously on server | npm install pm2 -g |
| 10 | Socket.IO | Run realtime chat and notifications | npm install socket.io |