What is Node.js?

Node.js is a JavaScript runtime built on Chrome's V8 engine. It allows you to run JavaScript on the server side.

Key Features

• Non-blocking I/O
• Event-driven architecture
• NPM package manager
• Cross-platform

Syntax

NODEJS

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const http = require('http');

const server = http.createServer((req, res) => {
    res.writeHead(200, {'Content-Type': 'text/html'});
    res.end('Hello, Node.js!');
});

server.listen(3000, () => {
    console.log('Server running on port 3000');
});

Hello Node.js

NODE

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const http = require("http");

const server = http.createServer((req, res) => {
    res.writeHead(200, { "Content-Type": "text/html" });
    res.end("<h1>Hello from Node.js!</h1>");
});

server.listen(3000, () => {
    console.log("Server running on port 3000");
});

Try It Yourself

Practice

1

Exercise

What is NPM?

Answer

Node Package Manager — manages JavaScript packages and dependencies.

Quick Quiz

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What engine powers Node.js?

SpiderMonkey

V8

Chakra

JavaScriptCore

Node.js is built on Chrome's V8 JavaScript engine.

Retry Quiz

Interview Questions

What is the event loop in Node.js?

The event loop handles asynchronous operations by processing callbacks and events in a non-blocking way.

Tutorial Complete

Back to Node.js