Why Node.js for server-side JavaScript in Node.js - See It in Action

Why Node.js for server-side JavaScript

📖 Scenario: You are building a simple server that responds to web requests. You want to understand why Node.js is a good choice for running JavaScript on the server.

🎯 Goal: Create a basic Node.js server script step-by-step to see how Node.js handles server-side JavaScript efficiently.

📋 What You'll Learn

Create a simple HTTP server using Node.js built-in modules

Set a port number for the server to listen on

Write the core logic to respond with a friendly message

Complete the server setup to start listening on the port

💡 Why This Matters

🌍 Real World

Node.js is widely used to build fast and scalable web servers that handle many users at once without slowing down.

💼 Career

Understanding how to create a basic Node.js server is a key skill for backend developers working with JavaScript.

1

DATA SETUP: Import the HTTP module

Write a line to import the built-in Node.js http module using import syntax.

Node.js

// Import the http module
// Your code here

Need a hint?

Use import http from 'http'; to bring in the HTTP module.

2

CONFIGURATION: Set the server port

Create a constant called port and set it to 3000.

Node.js

import http from 'http';

// Set the port number
// Your code here

Need a hint?

Use const port = 3000; to define the port.

3

CORE LOGIC: Create the server with a response

Use http.createServer with a function that takes req and res. Inside, write headers with res.writeHead(200, {'Content-Type': 'text/plain'}) and send the text 'Hello from Node.js!' with res.end(). Assign this server to a constant called server.

Node.js

import http from 'http';

const port = 3000;

// Create the server and respond with a message
// Your code here

Need a hint?

Use http.createServer and respond with a plain text message.

4

COMPLETION: Start the server listening on the port

Call server.listen with the port constant and add a callback function that logs 'Server running on port 3000'.

Node.js

import http from 'http';

const port = 3000;

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

// Start the server listening
// Your code here

Need a hint?

Use server.listen(port, () => { console.log(...) }) to start the server.