What is the util.promisify() function?

Short answer: util.promisify() converts traditional Node.js callback-style functions into functions that return promises — letting you use async/await with them.

Example code

const util = require('util');
const fs = require('fs');
const readFile = util.promisify(fs.readFile);
async function read() {
const content = await readFile('file.txt', 'utf8'); console.log(content); }

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.