Express.js Quiz – Express.js MCQ Questions and Answers

Express.js Quiz – Express.js MCQ Questions and Answers: From this section, practice the ExpressJS Multiple Choice Questions and Answers which will help you to prepare various campus interviews, walk-in interviews, company interviews, placements. Candidates can improve their skills by practicing the Express.js MCQ Questions and Answers. Express is a minimal and flexible Node. js web application framework. It is an open-source framework developed and maintained by Node. Take the Express.js MCQ Quiz, and test your professional knowledge in the Express.js Quiz Concepts. We hope that our team has provided accurate data on ExpressJS MCQ Questions.

Express.js Quiz – Overview

Express.js MCQ Questions and Answers – Practice Now

What is Express.js?
A) A Node.js framework
B) A PHP framework
C) A Java framework
D) A Python framework
Answer: A) A Node.js framework
Explanation: Express.js is a popular web application framework for Node.js, used for building fast, scalable, and secure web applications.

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What is middleware in Express.js?
A) A programming language
B) A library
C) A function
D) A database
Answer: C) A function
Explanation: Middleware is a function that sits between the server and the application, allowing you to add additional functionality to your application.

Which of the following is a templating engine commonly used with Express.js?
A) React
B) Angular
C) Handlebars
D) Vue.js
Answer: C) Handlebars
Explanation: Handlebars is a templating engine that is commonly used with Express.js, allowing developers to create dynamic HTML pages.

What is routing in Express.js?
A) The process of finding the shortest path between two nodes in a graph
B) The process of handling HTTP requests based on the URL and HTTP method
C) The process of optimizing the performance of an Express.js application
D) The process of securing an Express.js application
Answer: B) The process of handling HTTP requests based on the URL and HTTP method
Explanation: Routing in Express.js is the process of handling HTTP requests based on the URL and HTTP method, allowing developers to create APIs and web applications.

What is the purpose of the Express.js app.listen() function?
A) To start the application server
B) To stop the application server
C) To restart the application server
D) To connect to a database
Answer: A) To start the application server
Explanation: The app.listen() function in Express.js is used to start the application server and listen for incoming requests.

Which of the following HTTP methods is used to retrieve data from the server in Express.js?
A) GET
B) POST
C) PUT
D) DELETE
Answer: A) GET
Explanation: The GET method is used to retrieve data from the server in Express.js, while POST, PUT, and DELETE are used to send data to the server.

What is the purpose of the req object in Express.js?
A) To represent the HTTP request
B) To represent the HTTP response
C) To store session data
D) To store user authentication data
Answer: A) To represent the HTTP request
Explanation: The req object in Express.js represents the HTTP request and contains information such as the request URL, headers, and query parameters.

What is the purpose of the res object in Express.js?
A) To represent the HTTP request
B) To represent the HTTP response
C) To store session data
D) To store user authentication data
Answer: B) To represent the HTTP response
Explanation: The res object in Express.js represents the HTTP response and is used to send data back to the client.

Which of the following is an example of a middleware function in Express.js?
A) app.get()
B) app.post()
C) app.use()
D) app.listen()
Answer: C) app.use()
Explanation: app.use() is an example of a middleware function in Express.js, which is used to add middleware to the application.

What is the purpose of the Express.js Router?
A) To handle HTTP requests based on the URL and HTTP method
B) To handle authentication in the application
C) To handle database operations in the application
D) To handle server-side rendering in the application
Answer: A) To handle HTTP requests based on the URL and HTTP method
Explanation: The Express.js Router is used to handle HTTP requests based on the URL and HTTP method, allowing developers to create modular and reusable routes for their applications.

What is the purpose of the body-parser middleware in Express.js?
A) To parse JSON data in the request body
B) To parse URL-encoded data in the request body
C) To parse XML data in the request body
D) All of the above
Answer: D) All of the above
Explanation: The body-parser middleware in Express.js is used to parse JSON, URL-encoded, and XML data in the request body.

Which of the following is an example of a route parameter in Express.js?
A) /users
B) /users/:id
C) /users/create
D) /users/delete/:id
Answer: B) /users/:id
Explanation: /users/:id is an example of a route parameter in Express.js, where :id is a variable that can be used to retrieve data from the server.

What is the purpose of the Express.js Error Handler middleware?
A) To handle errors that occur in the application
B) To handle user authentication in the application
C) To handle database operations in the application
D) To handle server-side rendering in the application
Answer: A) To handle errors that occur in the application
Explanation: The Express.js Error Handler middleware is used to handle errors that occur in the application and send an appropriate response back to the client.

What is the purpose of the Express.js response.redirect() method?
A) To redirect the client to a different URL
B) To send data back to the client
C) To render a view template in the application
D) To handle errors that occur in the application
Answer: A) To redirect the client to a different URL
Explanation: The response.redirect() method in Express.js is used to redirect the client to a different URL.

What is the purpose of the Express.js response.render() method?
A) To redirect the client to a different URL
B) To send data back to the client
C) To render a view template in the application
D) To handle errors that occur in the application
Answer: C) To render a view template in the application
Explanation: The response.render() method in Express.js is used to render a view template in the application and send it back to the client.

Which of the following is an example of a view engine commonly used with Express.js?
A) React
B) Angular
C) Handlebars
D) Vue.js
Answer: C) Handlebars
Explanation: Handlebars is a popular view engine that is commonly used with Express.js to create dynamic HTML pages.

What is the purpose of the Express.js response.json() method?
A) To redirect the client to a different URL
B) To send data back to the client
C) To render a view template in the application
D) To handle errors that occur in the application
Answer: B) To send data back to the client
Explanation: The response.json() method in Express.js is used to send JSON data back to the client.

What is the purpose of the Express.js app.use() method?
A) To add middleware to the application
B) To handle HTTP requests based on the URL and HTTP method
C) To render a view template in the application
D) To redirect the client to a different URL
Answer: A) To add middleware to the application
Explanation: The app.use() method in Express.js is used to add middleware to the application, which can be used to modify the request and response objects, handle errors, and perform other tasks.

What is the purpose of the Express.js response.sendFile() method?
A) To redirect the client to a different URL
B) To send data back to the client
C) To render a view template in the application
D) To send a file back to the client
Answer: D) To send a file back to the client
Explanation: The response.sendFile() method in Express.js is used to send a file back to the client, such as an image or a PDF document.

Which of the following modules can be used to implement authentication in an Express.js application?
A) Passport.js
B) Sequelize.js
C) Mongoose.js
D) Knex.js
Answer: A) Passport.js
Explanation: Passport.js is a popular authentication middleware for Node.js and can be used to implement authentication in an Express.js application.