Creating and removing directories in Node.js - Quick Revision & Summary

Recall & Review

beginner

What Node.js module do you use to create and remove directories?

You use the fs module, which provides functions like mkdir to create and rmdir or rm to remove directories.

intermediate

How do you create a directory including any missing parent folders in Node.js?

Use fs.mkdir(path, { recursive: true }). The recursive: true option creates all missing parent directories automatically.

intermediate

What is the difference between fs.rmdir and fs.rm when removing directories?

fs.rmdir removes empty directories only. fs.rm with { recursive: true } can remove directories with files inside.

beginner

What happens if you try to create a directory that already exists without the recursive option?

Node.js will throw an error because the directory already exists. Using { recursive: true } prevents this error by ignoring existing directories.

advanced

How can you remove a directory and all its contents safely in Node.js?

Use fs.rm(path, { recursive: true, force: true }). This removes the directory and everything inside it without throwing errors if the directory doesn't exist.

Which option makes fs.mkdir create all missing parent directories?

A { recursive: false }

B { recursive: true }

C { force: true }

D { createParents: true }

The option { recursive: true } tells Node.js to create all missing parent directories.

Which method removes a directory only if it is empty?

A fs.mkdir

B fs.rm with recursive

C fs.rmdir

D fs.unlink

fs.rmdir removes empty directories only.

What does fs.rm(path, { force: true }) do?

A Removes a directory and ignores errors if it doesn't exist

B Creates a directory forcibly

C Removes files only

D Throws error if directory doesn't exist

The force: true option ignores errors if the directory or file does not exist.

If you try to create a directory that exists without recursive option, what happens?

A Directory is overwritten

B Parent directories are created

C Directory is ignored silently

D Error is thrown

Node.js throws an error if the directory exists and recursive option is not used.

Which Node.js module provides directory creation and removal functions?

A fs

B path

C http

D os

The fs module handles file system operations including directories.

Explain how to create a directory and all its missing parent directories in Node.js.

Think about the option that allows creating multiple levels of folders at once.

Describe the difference between removing an empty directory and removing a directory with files inside in Node.js.

Consider which methods allow deleting directories with content and which do not.

Practice

1. Which Node.js method is used to create a new directory?

easy

A. fs.createDir()

B. fs.rmdir()

C. fs.deleteDir()

D. fs.mkdir()

Solution

1. Step 1: Understand directory creation methods

   Node.js provides fs.mkdir() to create directories.

2. Step 2: Differentiate from removal methods

   fs.rmdir() is for removing directories, not creating.

3. Final Answer:

   fs.mkdir() -> Option D

4. Quick Check:

   Create directory = fs.mkdir() [OK]

Hint: Use fs.mkdir() to create folders, not fs.rmdir() [OK]

Common Mistakes:

• Confusing fs.mkdir() with fs.rmdir()
• Using non-existent fs.createDir()
• Trying to use fs.deleteDir() which doesn't exist

2. Which of the following is the correct syntax to create a nested directory parent/child in Node.js?

easy

A. fs.mkdir('parent/child', callback)

B. fs.mkdir('parent/child', { recursive: true }, callback)

C. fs.rmdir('parent/child', { recursive: true }, callback)

D. fs.mkdir('parent/child', { nested: true }, callback)

Solution

1. Step 1: Recognize recursive option for nested folders

   To create nested directories, use { recursive: true } option with fs.mkdir().

2. Step 2: Confirm correct method and options

   fs.mkdir with recursive true creates all needed folders; fs.rmdir is for removal, and nested option doesn't exist.

3. Final Answer:

   fs.mkdir('parent/child', { recursive: true }, callback) -> Option B

4. Quick Check:

   Nested folders need recursive: true [OK]

Hint: Use { recursive: true } with fs.mkdir for nested folders [OK]

Common Mistakes:

• Omitting recursive option for nested directories
• Using fs.rmdir instead of fs.mkdir
• Using incorrect option name like nested

3. What will happen if you run the following code snippet in Node.js?

const fs = require('fs');
fs.rmdir('myFolder', (err) => {
  if (err) console.log('Error:', err.message);
  else console.log('Folder removed');
});

Assuming myFolder contains files.

medium

A. Folder is removed successfully

B. Code throws a syntax error

C. Error logged because folder is not empty

D. Folder is renamed instead of removed

Solution

1. Step 1: Understand fs.rmdir behavior

   fs.rmdir only removes empty directories; if folder has files, it throws an error.

2. Step 2: Analyze error handling in callback

   The callback logs error message if removal fails due to non-empty folder.

3. Final Answer:

   Error logged because folder is not empty -> Option C

4. Quick Check:

   Non-empty folder removal = error [OK]

Hint: fs.rmdir fails if folder has files; must delete files first [OK]

Common Mistakes:

• Assuming fs.rmdir removes non-empty folders
• Expecting folder rename instead of removal
• Thinking code throws syntax error

4. Identify the error in this code snippet that tries to remove a directory:

const fs = require('fs');
fs.rmdir('testDir', { recursive: true }, (err) => {
  if (err) throw err;
  console.log('Directory removed');
});

medium

A. fs.rmdir does not support recursive option

B. Callback function is missing

C. fs.rmdir cannot remove directories

D. Directory path must be absolute

Solution

1. Step 1: Check fs.rmdir method options

   fs.rmdir does not support the recursive option; fs.rm should be used instead for recursive removal.

2. Step 2: Understand correct method for recursive removal

   Use fs.rm with { recursive: true } to remove non-empty directories recursively.

3. Final Answer:

   fs.rmdir does not support recursive option -> Option A

4. Quick Check:

   Recursive removal needs fs.rm, not fs.rmdir [OK]

Hint: Use fs.rm for recursive removal, not fs.rmdir [OK]

Common Mistakes:

• Using recursive option with fs.rmdir
• Thinking callback is missing
• Believing directory path must be absolute

5. You want to create a nested directory projects/app/src and then remove it completely including all files inside. Which sequence of Node.js methods should you use?

hard

A. Use fs.mkdir with { recursive: true } to create, then fs.rm with { recursive: true, force: true } to remove

B. Use fs.mkdir without options to create, then fs.rmdir to remove

C. Use fs.mkdir with { recursive: true } to create, then fs.rmdir to remove

D. Use fs.mkdir to create, then fs.unlink to remove

Solution

1. Step 1: Create nested directories

   Use fs.mkdir with { recursive: true } to create nested folders in one step.

2. Step 2: Remove directory with all contents

   Use fs.rm with { recursive: true, force: true } to delete directory and all files inside safely.

3. Final Answer:

   Use fs.mkdir with { recursive: true } to create, then fs.rm with { recursive: true, force: true } to remove -> Option A

4. Quick Check:

   Nested create + recursive remove = fs.mkdir + fs.rm [OK]

Hint: Create nested with mkdir recursive, remove all with rm recursive force [OK]

Common Mistakes:

• Using fs.rmdir to remove non-empty directories
• Omitting recursive option when creating nested folders
• Using fs.unlink which deletes files, not folders