How do you handle CORS in Node.js?

Short answer: CORS (Cross-Origin Resource Sharing) allows servers to specify who can access their APIs. ✅ Use the cors middleware: npm install cors const cors = require('cors'); app.use(cors()); You can also customize it: app.use(cors({ origin: ' }));

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.