Node.js Modules: A Comprehensive Guide for Beginners

Question 1

Which of these is **NOT** a direct benefit of using modules in Node.js?

Accepted Answer

Drastically reducing development time

Answer

Sharing and reusing code

Answer

Organizing code effectively

Answer

Making code more flexible and maintainable

Question 2

In Node.js, which method is NOT used to export a module?

Accepted Answer

export keyword

Answer

module.exports object

Answer

exports object

Question 3

Which of the following best characterizes Node.js modules?

Accepted Answer

Reusable code units

Answer

Single-inheritance components

Answer

Dynamically bound functions

Answer

Interface-implementing entities

Question 4

In Node.js, the designation of a variable or function to be accessible outside the module is facilitated by:

Accepted Answer

module.exports

Answer

module.import

Answer

export.module

Question 5

The primary purpose of the 'exports' object in Node.js modules is to:

Accepted Answer

Specify publicly accessible module components

Answer

Define module dependencies

Answer

Control module execution order

Question 6

Which benefit is most directly associated with utilizing Node.js modules?

Accepted Answer

Enhanced code organization and maintainability

Answer

Accelerated execution speed

Answer

Heightened security

Answer

Minimized memory consumption

Question 7

Which module type is not recognized in the context of Node.js?

Accepted Answer

External module

Answer

Built-in module

Answer

CommonJS module

Answer

ES module

Question 8

What is the primary purpose of using modules in Node.js?

Accepted Answer

Code reusability and organization.

Answer

Enhanced debugging capabilities.

Answer

Increased performance.

Answer

Reduced memory usage.

Question 9

What is the main purpose of the 'package.json' file in a Node.js project?

Accepted Answer

To define project metadata and dependencies.

Answer

To manage user permissions.

Answer

To store the source code for the project.

Answer

To specify the build process for the project.

Question 10

Which of the following is the purpose of the 'module.exports' object in Node.js?

Accepted Answer

To expose the module's public API.

Answer

To handle module loading and execution.

Answer

To store all the required modules.

Answer

To define the module's dependencies.

Question 11

Which of the following is a recommended design principle when organizing Node.js modules?

Accepted Answer

Keep modules cohesive and loosely coupled.

Answer

Avoid using subdirectories for modules.

Answer

Name modules using short and cryptic abbreviations.

Answer

Export all variables and functions from each module.

Question 12

What is the primary advantage of using ES modules over CommonJS modules in Node.js?

Accepted Answer

Increased flexibility and improved code organization.

Answer

Faster module loading.

Answer

Enhanced compatibility with legacy code.

Answer

Reduced memory consumption.

Question 13

Which of the following is the correct syntax to export a module in Node.js?

Accepted Answer

module.exports = { ... }

Answer

require { ... }

Answer

export { ... }

Answer

exports { ... }

Question 14

What is the primary purpose of the 'require' function in Node.js?

Accepted Answer

To import modules into the current script.

Answer

To run modules.

Answer

To create new modules.

Answer

To export modules.

Question 15

What is a key advantage of utilizing modules in Node.js?

Accepted Answer

Code organization and reusability.

Answer

Improved security.

Answer

Enhanced error handling.

Answer

Boosted performance.

Question 16

How would you define a CommonJS module?

Accepted Answer

A module that employs 'require' and 'module.exports' for importing and exporting functionality.

Answer

A module written in ECMAScript 6.

Answer

A module that utilizes 'import' and 'export' syntax.

Question 17

What is the primary purpose of the 'package.json' file in a Node.js project?

Accepted Answer

To store project information, including module dependencies.

Answer

To manage the project's build process.

Answer

To set the project's version and name.

Question 18

What functionality does the 'path' module provide in Node.js?

Accepted Answer

Functions for manipulating file and directory paths.

Answer

Functions for creating and managing system processes.

Answer

Functions for making HTTP requests.

Question 19

Which of the following is NOT a built-in module in Node.js?

Accepted Answer

mysql

Answer

path

Answer

fs

Answer

http

Question 20

Describe the primary distinction between 'require' and 'import' in Node.js.

Accepted Answer

'require' can import both built-in and external modules, while 'import' is only used to import external modules.

Answer

'require' imports external modules, while 'import' imports built-in modules.

Question 21

Which advantage do modules provide in Node.js applications?

Accepted Answer

They promote code reusability, maintainability, and encapsulation.

Answer

They enhance the performance of the application.

Answer

They reduce the overall size of the codebase.

Question 22

What is the primary purpose of the 'package.json' file in a Node.js project?

Accepted Answer

It contains metadata about the project, including its name, version, dependencies, and scripts.

Answer

It specifies the entry point of the application.

Answer

It stores the source code for the project.

Question 23

What is the purpose of the 'NODE_PATH' environment variable in Node.js?

Accepted Answer

It defines a list of directories where Node.js should search for modules.

Answer

It sets the default port for HTTP servers.

Answer

It specifies the path to the Node.js executable.

Question 24

Which of the following accurately describes the purpose of a Node.js module?

Accepted Answer

It provides a way to encapsulate and reuse code, organizing it into logical units.

Answer

It manages data storage and retrieval.

Answer

It allows for asynchronous execution of code.

Answer

It assists in handling HTTP requests.

Question 25

What is the expected outcome if a Node.js module does not explicitly export anything?

Accepted Answer

The module itself is returned.

Answer

The module is loaded but remains inaccessible.

Answer

An error is triggered.

Answer

The module is omitted, and the next one is loaded.

Question 26

Identify a primary advantage of utilizing Node.js modules.

Accepted Answer

Enhanced code reusability and maintainability

Answer

Automatic dependency management

Answer

Heightened security

Answer

Improved performance

Question 27

What is the primary function of the 'package.json' file in a Node.js project?

Accepted Answer

It stores metadata about the project and its dependencies.

Answer

It serves as a configuration file for the project's server.

Answer

It defines the structural organization of the project's modules.

Question 28

Which tool is commonly used for managing dependencies in Node.js projects?

Accepted Answer

npm

Answer

apt-get

Answer

gem

Answer

pip

Question 29

Explain the distinction between 'local' and 'global' modules in Node.js.

Accepted Answer

Local modules are installed within the project directory, while global modules are installed globally.

Answer

Local modules are used for development, while global modules are used for production.

Answer

Local modules are modifiable, unlike global modules.

Question 30

Which practice is recommended for organizing modules in a Node.js application?

Accepted Answer

Adhere to a consistent naming convention and group related modules into subdirectories.

Answer

Store all modules in a single directory.

Answer

Create a separate module for every minor function.

Question 31

What is the primary purpose of using modules in Node.js?

Accepted Answer

To organize code into reusable units and enhance code maintainability.

Answer

To create separate files for different functionalities, without enabling code reusability.

Answer

To improve the performance of Node.js applications by reducing code size.

Question 32

How do you import a module named 'utils' into a Node.js script?

Accepted Answer

const utils = require('./utils');

Answer

load utils from './utils';

Answer

import utils from './utils';

Answer

include utils from './utils';

Question 33

What is the difference between 'require' and 'import' in Node.js?

Accepted Answer

'require' is a CommonJS module system, while 'import' is an ES6 module system. 'require' is synchronous, while 'import' is asynchronous.

Answer

Both 'require' and 'import' are identical in functionality.

Question 34

Consider a module named 'math.js' with a function 'add(a, b)'. How would you call the 'add' function from another script?

Accepted Answer

const math = require('./math');
console.log(math.add(2, 3));

Answer

import add from './math';
console.log(add(2, 3));

Answer

const add = require('./math');
console.log(add(2, 3));

Question 35

What is the purpose of a module's 'exports' object?

Accepted Answer

It acts as a collection point for elements (functions, variables, classes) the module wants to expose.

Answer

It stores all the private data of the module that is not meant to be accessed externally.

Question 36

Which of these practices is NOT recommended for creating well-structured Node.js modules?

Accepted Answer

Exporting every function and variable from a module without considering their intended use.

Answer

Using descriptive names for modules and their exported elements.

Answer

Separating related functionality into different modules.

Question 37

How can you create a module that can be reused in multiple projects?

Accepted Answer

Publish the module to a package manager like npm.

Answer

Create a symbolic link to the module's folder in each project.

Answer

Copy the module's code into each project where it's needed.

Answer

Use a code sharing platform like GitHub to share the module's code.

Question 38

Which of these is a benefit of using Node.js modules?

Accepted Answer

Reduced code duplication, leading to easier maintenance and updates.

Answer

Increased complexity in the codebase due to the introduction of multiple files.

Answer

Slower execution times due to the need to load multiple modules.

Question 39

What is the concept of 'dependency management' in Node.js modules?

Accepted Answer

The process of defining and managing the external modules that a project depends on.

Answer

The process of organizing and structuring a project's source code.

Answer

The process of creating and maintaining reusable modules within a project.

Question 40

What is the primary purpose of using modules?

Accepted Answer

To organize code into reusable units to enhance code maintainability and reduce duplication.

Answer

To improve performance.

Answer

To enhance security.

Answer

To facilitate debugging.

Question 41

How do you import the 'myModule' module in Node.js?

Accepted Answer

const myModule = require('./myModule.js');

Answer

include myModule from './myModule.js';

Answer

use myModule from './myModule.js';

Answer

import myModule from './myModule.js';

Question 42

How do you export the 'calculateAverage' function from the 'utils.js' module?

Accepted Answer

module.exports.calculateAverage = calculateAverage;

Answer

export { calculateAverage };

Answer

export calculateAverage = calculateAverage;

Answer

export calculateAverage

Question 43

Which is NOT an advantage of using modules in Node.js?

Accepted Answer

Increased code complexity

Answer

Code reusability

Answer

Enhanced maintainability

Answer

Improved code organization

Question 44

What is the recommended practice for organizing related code into modules in a large project?

Accepted Answer

Create separate files for each module, grouped into logical folders.

Answer

Organize modules based solely on their functionality.

Answer

Utilize a single, large module for the entire project.

Answer

Keep all modules in a single file.

Question 45

How do you install the 'bcrypt' module using npm?

Accepted Answer

npm install bcrypt

Answer

Download 'bcrypt' from the npm website.

Answer

yarn add bcrypt

Answer

pip install bcrypt

Question 46

What is the primary function of the 'require' method in Node.js?

Accepted Answer

To import and load modules into the current script.

Answer

To export functions from modules.

Answer

To create new modules.

Answer

To manage module dependencies.

Question 47

How do you call the 'add' function from the 'calculator.js' module in your main script?

Accepted Answer

const calculator = require('./calculator.js');
console.log(calculator.add(5, 3));

Answer

const add = require('./calculator.js.add');
console.log(add(5, 3));

Answer

import { add } from './calculator.js';
console.log(add(5, 3));

Answer

console.log(calculator.add(5, 3));

Question 48

Which method is NOT used for exporting modules in Node.js?

Accepted Answer

export default

Answer

export

Answer

module.exports

Answer

exports

Question 49

What is the primary purpose of the 'require' method in Node.js?

Accepted Answer

To import modules from external files.

Answer

To create new modules.

Answer

To export modules to external files.

Answer

To load external libraries.

Question 50

Which advantage do modules provide in Node.js?

Accepted Answer

Code reusability

Answer

Enhanced security

Answer

Reduced file size

Answer

Improved performance

Question 51

What is the key difference between a local module and a third-party module in Node.js?

Accepted Answer

Local modules are created within your current project, while third-party modules are developed and distributed by external developers.

Answer

Third-party modules are only for frontend development, while local modules are used for backend logic.

Answer

Local modules are generally more efficient than third-party modules.

Answer

Third-party modules are always free to use, while local modules might require licensing.

Question 52

Which of the following variables provides the full path of the currently executing module in Node.js?

Accepted Answer

__filename

Answer

require.path

Answer

import.meta.url

Answer

__dirname

Question 53

Which of these data types is NOT typically exported or imported in Node.js modules?

Accepted Answer

Undefined

Answer

Object

Answer

Number

Answer

String

Question 54

What is the primary purpose of using the 'async' keyword when exporting a function in a Node.js module?

Accepted Answer

To signal that the exported function is asynchronous and might involve operations like network requests or file reading.

Answer

To make the function run faster by using asynchronous processing.

Answer

To specify that the function can only be used in asynchronous environments.

Answer

To prevent the module from being loaded until it is needed.

Question 55

What is a generally accepted best practice for organizing Node.js modules within a project?

Accepted Answer

Create separate modules for distinct functionalities, enhancing code readability and maintainability.

Answer

Keep all modules in a single file, as it simplifies maintenance.

Answer

Use nested modules to avoid creating multiple files, as it reduces file count.

Answer

Organize modules based on the order they are used in the application.

Question 56

What is a significant advantage of using the Node Package Manager (NPM) for managing Node.js modules?

Accepted Answer

NPM simplifies the process of installing and managing third-party modules, making it easy to incorporate external functionality into projects.

Answer

NPM automatically updates modules to their latest versions, ensuring you always have the newest features.

Answer

NPM provides built-in security features to prevent malicious modules from being installed.

Answer

NPM can be used to create and distribute your own modules, making it easy to share your code.

Question 57

Which of the following is the command used to install a third-party module using NPM?

Accepted Answer

npm install <module-name>

Answer

npm download <module-name>

Answer

npm get <module-name>

Answer

npm add <module-name>