Node.js and Express.js: A Comprehensive Guide for Beginners

Question 1

Which of the following accurately describes Node.js?

Accepted Answer

An event-driven, asynchronous programming platform

Answer

A synchronous, single-threaded programming environment

Answer

A statically-typed, object-oriented programming language

Answer

A server-side scripting language designed for web development

Question 2

What is the primary function of Express.js in web development?

Accepted Answer

Handling HTTP requests and responses, providing routing capabilities

Answer

Managing database connections and user authentication

Answer

Rendering dynamic web pages using HTML templates

Answer

Parsing and validating user input on the server-side

Question 3

In Express.js applications, what is the primary role of middleware?

Accepted Answer

Processing HTTP requests before they reach route handlers, enabling pre-processing and post-processing functionality

Answer

Storing user session data and managing user authentication

Answer

Handling database queries and performing CRUD operations

Answer

Rendering views and generating dynamic content for responses

Question 4

What is the purpose of the 'res.render()' method in Express.js?

Accepted Answer

Sending a response with a specified view template, allowing for server-side rendering

Answer

Redirecting the user to another page or URL

Answer

Setting cookies in the user's browser for session management

Answer

Processing user input and validating form data

Question 5

Which of the following is a recommended practice for error handling in Express.js applications?

Accepted Answer

Using error-handling middleware to catch and handle errors gracefully, providing informative error messages

Answer

Displaying error messages directly in the views, relying on the default error handling behavior

Answer

Ignoring errors to maintain code simplicity and avoid unnecessary complexity

Answer

Using the 'try' and 'catch' blocks for error handling, but without implementing custom error middleware

Question 6

What is the distinction between a 'route' and a 'path' in the context of Express.js?

Accepted Answer

A route defines the URL pattern and the associated callback function, while a path is a specific URL that matches the route pattern

Answer

A path defines the URL pattern and the associated callback function, while a route is a specific URL that matches the path pattern

Answer

Routes and paths are interchangeable terms in Express.js, and they both refer to URL patterns

Answer

Paths are used exclusively for GET requests, while routes can be used for any HTTP method

Question 7

Which of the following is NOT a popular module commonly used for user authentication in Node.js applications?

Accepted Answer

bcrypt (for password hashing)

Answer

Passport.js

Answer

Express-session

Answer

JWT (JSON Web Tokens)

Question 8

What is the primary reason for using a template engine in Express.js applications?

Accepted Answer

To separate the logic from the presentation layer, allowing for cleaner and more maintainable code

Answer

To enhance the performance of web applications by optimizing the rendering process

Answer

To improve the security of user input by sanitizing and validating data before rendering

Answer

To support multiple programming languages within a single application, making development more versatile

Question 9

Which of the following most accurately describes the primary role of Node.js?

Accepted Answer

A runtime environment for server-side JavaScript applications

Answer

A web browser that interprets and executes JavaScript code

Answer

A library for building interactive web pages

Answer

A framework for developing mobile applications

Question 10

In Node.js, which programming paradigm is primarily employed?

Accepted Answer

Asynchronous programming

Answer

Object-oriented programming

Answer

Procedural programming

Answer

Functional programming

Question 11

Within Express.js, which module is specifically responsible for routing HTTP requests?

Accepted Answer

router

Answer

request

Answer

response

Answer

express

Question 12

In Express.js, what is the correct syntax for creating a server?

Accepted Answer

const app = express()

Answer

const app = require('express')()

Answer

const app = createExpressApp()

Answer

const app = new Express()

Question 13

Which HTTP method is typically utilized for submitting data to a server?

Accepted Answer

POST

Answer

GET

Answer

PUT

Answer

DELETE

Question 14

Which of the following accurately describes Node.js's architectural approach?

Accepted Answer

Single-threaded with an event-driven architecture

Answer

Synchronous and single-threaded

Answer

Multi-threaded and synchronous

Answer

Multi-threaded with an event-driven architecture

Question 15

In Node.js, what is the primary purpose of the 'require()' function?

Accepted Answer

Importing external modules into the application

Answer

Creating new objects within the application

Answer

Defining functions for use in the application

Answer

Handling exceptions that may occur during execution

Question 16

Which of the following is NOT an advantage of using Express.js in web development?

Accepted Answer

In-built multi-threading support

Answer

Simplified routing configuration

Answer

Support for middleware

Answer

Templating capabilities

Question 17

In Express.js, what is the intended use of the 'app.get()' method?

Accepted Answer

Defining a route that responds to GET requests

Answer

Sending a response to a client's request

Answer

Creating a new Express.js application instance

Answer

Handling errors that occur during request processing

Question 18

What is the primary purpose of using the 'res.render()' function in Express.js?

Accepted Answer

Rendering a dynamic HTML file using a template engine

Answer

Sending a static HTML file as a response

Answer

Redirecting the client to a different URL

Answer

Validating user input on the server-side

Question 19

Could you explain the fundamental difference between 'GET' and 'POST' requests in Express.js?

Accepted Answer

GET requests are designed for retrieving data, while POST requests are used to send data.

Answer

GET requests are inherently secure, unlike POST requests.

Answer

POST requests can accommodate larger amounts of data compared to GET requests.

Answer

There is no distinction in functionality between GET and POST requests.

Question 20

In Node.js, how does the event-driven programming approach enhance web development?

Accepted Answer

Node.js uses an event loop to efficiently handle events, enabling responsive and scalable web applications.

Answer

Node.js processes events sequentially, ensuring a structured and predictable flow.

Answer

Node.js relies on polling to detect events, which can be inefficient and resource-intensive.

Question 21

How does middleware in Express.js contribute to the development of robust and maintainable web applications?

Accepted Answer

It provides a structured way to handle and modify requests and responses

Answer

It ensures data encryption and protection

Answer

It optimizes performance through caching

Answer

It reduces the number of lines of code required for application development

Question 22

Which of the following is NOT a key feature of Node.js?

Accepted Answer

Synchronous programming model

Answer

Cross-platform compatibility

Answer

Event-driven architecture

Answer

Asynchronous I/O

Question 23

What is the purpose of using 'app.get()' in Express.js?

Accepted Answer

To define a route handler for HTTP GET requests

Answer

To create a new middleware function

Answer

To establish a database connection

Answer

To render a view template

Question 24

Which of the following is a valid syntax for creating a middleware function in Express.js?

Accepted Answer

app.use((req, res, next) => {});

Answer

app.middleware((req, res, next) => {});

Answer

app.callback((req, res, next) => {});

Answer

app.function((req, res, next) => {});

Question 25

What is the primary advantage of using Node.js for building real-time applications?

Accepted Answer

Its event-driven architecture and non-blocking I/O

Answer

Its large standard library

Answer

Its compatibility with all major operating systems

Answer

Its optimized performance for handling large data sets

Question 26

Which of the following is a method used to handle asynchronous operations in Node.js?

Accepted Answer

Promises

Answer

Threads

Answer

Semaphores

Question 27

What is the purpose of using 'res.send()' in Express.js?

Accepted Answer

To send a response to the client

Answer

To redirect to another route

Answer

To set a cookie

Answer

To render a view template

Question 28

Which of the following is a valid syntax for defining a static file serving route in Express.js?

Accepted Answer

app.use(express.static('public'));

Answer

app.static('public');

Answer

app.serve('public');

Answer

app.files('public');

Question 29

What is the difference between 'npm install' and 'npm install --save'?

Accepted Answer

The latter adds the installed package to the project's 'package.json' file

Answer

The former installs the package globally

Answer

The latter installs the latest version of the package

Question 30

Which of the following is a benefit of using Express.js for web development?

Accepted Answer

Simplified routing and middleware management

Answer

Enhanced security features out of the box

Answer

Automatic database connectivity

Answer

Increased performance compared to Node.js alone

Question 31

What is the purpose of using a template engine in Express.js?

Accepted Answer

To generate dynamic HTML responses based on data

Answer

To perform database operations

Answer

To handle user authentication