How do you create a custom Node.js module?

Short answer: pp.js — Use the custom module const math = require('./mathUtils'); console.log(math.add(5, 3)); // Output: 8 console.log(math.subtract(10, 4)); // Output: 6 ✅ This pattern helps you break code into organized, testable, and reusable pieces — just like using built-in or third-party libraries.

Explain a bit more

dvanced Node.js Concepts pp.js — Use the custom module const math = require('./mathUtils'); console.log(math.add(5, 3)); // Output: 8 console.log(math.subtract(10, 4)); // Output: 6 ✅ This pattern helps you break code into organized, testable, and reusable pieces — just like using built-in or third-party libraries.

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.