How do you handle file uploads in Node.js REST APIs?

Short answer: Use the multer middleware: npm install multer 📌 Example: const multer = require('multer'); const upload = multer({ dest: 'uploads/' }); app.post('/upload', upload.single('file'), (req, res) => { res.send('File uploaded'); });

Example code

Use the multer middleware: npm install multer 📌 Example: const multer = require('multer');
const upload = multer({ dest: 'uploads/' }); app.post('/upload', upload.single('file'), (req, res) => { res.send('File uploaded'); });

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.