Modules & NPM

Node.js uses modules to organize code. You can use built-in modules or install packages from NPM.

Module Types

• Core modules: fs, http, path, os
• Local modules: your own files
• Third-party: installed via NPM

Syntax

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// Import a module
const fs = require('fs');

// ES Module
import express from 'express';

// Export
module.exports = { myFunction };

Node.js Modules

NODE

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// math.js
function add(a, b) { return a + b; }
function subtract(a, b) { return a - b; }
module.exports = { add, subtract };

// app.js
const math = require("./math");
console.log(math.add(5, 3));
console.log(math.subtract(10, 4));

// ES modules
// import { add } from "./math.js";

Try It Yourself

Practice

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Exercise

How do you import a built-in module in Node.js?

Answer

const fs = require('fs');

Quick Quiz

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What does NPM stand for?

Node Package Manager

New Package Manager

Node Program Manager

Network Package Manager

NPM stands for Node Package Manager.

Retry Quiz

Interview Questions

What is the difference between require and import?

require is CommonJS (Node.js default). import is ES Modules (modern standard). Both load modules.

Tutorial Complete

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