How Express builds on Node.js HTTP - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an Express app instance.

Express

const express = require('express');
const app = express();

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

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

Alisten

Bget

Cuse

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'listen' instead of 'get' to define a route.

The get method defines a route handler for GET requests on the root path.

2fill in blank

medium

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

Express

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

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

Alisten

Bstart

Crun

Dopen

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' or 'run' which are not Express methods.

The listen method starts the server and listens on the specified port.

3fill in blank

hard

Fix the error in the code to correctly create an HTTP server using Express.

Express

const http = require('http');
const express = require('express');
const app = express();

const server = http.createServer([1]);
server.listen(3000);

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

Aapp

Bapp.listen()

Cexpress()

Dhttp

Attempts:

3 left

💡 Hint

Common Mistakes

Passing app.listen() which starts the server instead of passing app.

The http.createServer method expects a request listener function, which Express app provides.

4fill in blank

hard

Fill both blanks to create an Express app and start the HTTP server on port 4000.

Express

const http = require('http');
const express = require('express');
const app = [1]();
const server = http.createServer([2]);
server.listen(4000);

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

Aexpress

Bapp

Chttp

Dlisten

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'http' instead of 'app' to createServer.

First, call express() to create the app. Then pass app to createServer.

5fill in blank

hard

Fill all three blanks to define a GET route and start the Express server on port 5000.

Express

const express = require('express');
const app = express();

app.[1]('/hello', (req, res) => {
  res.[2]('Hello Express');
});

app.[3](5000, () => {
  console.log('Server listening on port 5000');
});

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

Aget

Bsend

Clisten

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'post' instead of 'get' for the route.

Use get to define the route, send to respond, and listen to start the server.