How Node.js differs from browser JavaScript in Node.js - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the built-in 'fs' module in Node.js.

Node.js

const fs = require([1]);

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

A'http'

B'fs'

C'express'

D'path'

Attempts:

3 left

💡 Hint

Common Mistakes

Using browser-specific modules like 'express' instead of 'fs'.

Forgetting to put quotes around the module name.

Node.js uses require to import built-in modules like fs for file system operations.

2fill in blank

medium

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

Node.js

const http = require('http');
http.createServer((req, res) => {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World');
}).[1](3000);

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

Alisten

Bstart

Copen

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods like 'start' or 'run' which do not exist on the server object.

Forgetting to call the method with parentheses.

The listen method starts the server on the specified port.

3fill in blank

hard

Fix the error in the code to read a file asynchronously in Node.js.

Node.js

const fs = require('fs');
fs.readFile('example.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log([1]);
});

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

Aexample.txt

Berr

Cfs

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Logging the error object instead of the file content.

Trying to log the module or file name instead of the data.

The callback receives the file content as data, which should be logged.

4fill in blank

hard

Fill both blanks to export a function named 'greet' in Node.js.

Node.js

function greet() {
  console.log('Hello!');
}
module.[1] = [2];

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

Aexports

Bgreet

Cmodule

Drequire

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'require' instead of 'exports' for exporting.

Assigning the wrong variable to exports.

Use module.exports to export the greet function so other files can use it.

5fill in blank

hard

Fill all three blanks to create a simple Express server that responds with 'Hi' on the root path.

Node.js

const express = require([1]);
const app = express();
app.[2]('/', (req, res) => {
  res.[3]('Hi');
});
app.listen(3000);

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

A'express'

Bget

Csend

D'http'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'http' instead of 'express' for the module name.

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

Using 'write' instead of 'send' to respond.

Import Express with 'express', use get to handle GET requests, and send to send the response.