Writing files in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Node.js file system module.

Node.js

const fs = require([1]);

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

A"path"

B"file"

C"filesystem"

D"fs"

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect module names like "file" or "filesystem".

Forgetting to put quotes around the module name.

The correct module name to import for file system operations in Node.js is "fs".

2fill in blank

medium

Complete the code to write the string 'Hello World' to a file named 'hello.txt' asynchronously.

Node.js

fs.[1]('hello.txt', 'Hello World', (err) => {
  if (err) throw err;
  console.log('File saved!');
});

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

AwriteFile

BreadFile

CappendFile

Dopen

Attempts:

3 left

💡 Hint

Common Mistakes

Using readFile instead of writeFile.

Using appendFile which adds to the file instead of replacing.

The method to write data to a file asynchronously is writeFile.

3fill in blank

hard

Fix the error in the code to write 'Data' to 'data.txt' synchronously.

Node.js

fs.[1]('data.txt', 'Data');

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

AwriteFileSync

BwriteFile

CreadFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using readFileSync which reads instead of writes.

Using writeFile without Sync for synchronous code.

The synchronous method to write a file is writeFileSync.

4fill in blank

hard

Fill both blanks to append 'More text' to 'log.txt' asynchronously and handle errors.

Node.js

fs.[1]('log.txt', 'More text', ([2]) => {
  if ([2]) throw [2];
  console.log('Append complete');
});

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

AappendFile

Berr

Cerror

DwriteFile

Attempts:

3 left

💡 Hint

Common Mistakes

Using writeFile which overwrites the file.

Using a callback parameter name other than 'err' or 'error'.

appendFile is used to add data to a file without overwriting. The callback error parameter is commonly named 'err'.

5fill in blank

hard

Fill all three blanks to write JSON data to 'config.json' asynchronously with error handling.

Node.js

const data = JSON.stringify([1]);
fs.[2]('config.json', data, ([3]) => {
  if ([3]) throw [3];
  console.log('Config saved');
});

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

Asettings

BwriteFile

Cerr

Dconfig

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong object name in JSON.stringify.

Using writeFileSync instead of writeFile.

Using a callback parameter name other than 'err'.

We stringify the 'config' object, use writeFile to save asynchronously, and handle errors with the 'err' parameter.