Why building HTTP servers matters in Node.js - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic HTTP server in Node.js.

Node.js

const http = require('http');
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end([1]);
});
server.listen(3000, () => {
  console.log('Server running on port 3000');
});

Drag options to blanks, or click blank then click option'

A'Hello World!'

B'Goodbye!'

C'Error!'

D'Welcome!'

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect response text

Forgetting to end the response

The server responds with 'Hello World!' text to any request.

2fill in blank

medium

Complete the code to listen on port 8080 instead of 3000.

Node.js

server.listen([1], () => {
  console.log('Server running on port 8080');
});

Drag options to blanks, or click blank then click option'

A8080

B3000

C80

D5000

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving the port as 3000

Using a port number below 1024 without permissions

Port 8080 is commonly used for HTTP servers during development.

3fill in blank

hard

Fix the error in the code to properly import the HTTP module using modern ES modules syntax.

Node.js

import [1] from 'http';

const server = http.createServer((req, res) => {
  res.end('Hi');
});

Drag options to blanks, or click blank then click option'

Ahttp

B{ http }

CHttp

D* as http

Attempts:

3 left

💡 Hint

Common Mistakes

Using default import syntax which is invalid for 'http' module

Using incorrect casing

Using 'import * as http from "http";' correctly imports the entire module as an object.

4fill in blank

hard

Fill both blanks to send a JSON response with status code 200.

Node.js

const server = http.createServer((req, res) => {
  res.statusCode = [1];
  res.setHeader('Content-Type', [2]);
  res.end(JSON.stringify({ message: 'Success' }));
});

Drag options to blanks, or click blank then click option'

A200

B'application/json'

C'text/html'

D404

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong status code

Setting wrong Content-Type header

Status code 200 means OK, and 'application/json' tells the browser the response is JSON.

5fill in blank

hard

Fill all three blanks to create a server that responds with HTML content on port 5000.

Node.js

const server = http.createServer((req, res) => {
  res.statusCode = [1];
  res.setHeader('Content-Type', [2]);
  res.end([3]);
});
server.listen(5000, () => {
  console.log('Server running on port 5000');
});

Drag options to blanks, or click blank then click option'

A200

B'text/html'

C'<h1>Welcome!</h1>'

D'application/json'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong status code

Wrong Content-Type header

Sending plain text instead of HTML

The server sends a 200 OK status, sets the content type to HTML, and sends a simple HTML heading.