What is Express - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a basic Express app.

Express

const express = require('[1]');
const app = express();

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

Apath

Bexpress

Cfs

Dhttp

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' instead of 'express' to create the app

Forgetting to require the express module

The express module is required to create an Express app.

2fill in blank

medium

Complete the code to start the Express server on port 3000.

Express

app.listen([1], () => {
  console.log('Server running on port 3000');
});

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

A8080

B5000

C3000

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Using a port number different from 3000 without updating the message

Passing a string instead of a number

Port 3000 is commonly used for local Express servers.

3fill in blank

hard

Fix the error in the route handler to send 'Hello World' as response.

Express

app.get('/', (req, res) => {
  res.[1]('Hello World');
});

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

Asend

Bwrite

Cend

DwriteHead

Attempts:

3 left

💡 Hint

Common Mistakes

Using Node.js response methods like write or end instead of Express's send

Forgetting to send a response

The send method sends the response body in Express.

4fill in blank

hard

Fill both blanks to create a JSON response with Express.

Express

app.get('/data', (req, res) => {
  res.[1]({ message: 'Hello' });
  res.[2]();
});

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

Ajson

Bsend

Cend

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Calling send after json which can cause errors

Not ending the response

Use json to send JSON data and end to finish the response.

5fill in blank

hard

Fill all three blanks to create a middleware that logs request method and URL.

Express

app.use(([1], [2], [3]) => {
  console.log(`$[1].method $[2].url`);
  next();
});

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

Areq

Bres

Cnext

Drequest

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter names

Forgetting to call next() to continue

Middleware functions receive req, res, and next as parameters.