Node JS MCQs - 4

Which of the following modules is commonly used for routing in Node.js web applications?

• A) http
• B) fs
• C) express
• D) os

Answer: C) express

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

• A) To send an HTTP response with JSON data
• B) To send an HTTP response with HTML content
• C) To send an HTTP response with a file attachment
• D) To send an HTTP request to another server

Answer: B) To send an HTTP response with HTML content

In the context of Express.js middleware, what does next() do?

• A) Moves to the next route handler
• B) Ends the current request-response cycle
• C) Sends the response to the client
• D) Starts a new request-response cycle

Answer: A) Moves to the next route handler

What is the purpose of the req.params object in Express.js?

• A) To access request query parameters
• B) To access request headers
• C) To access URL route parameters
• D) To access request body parameters

Answer: C) To access URL route parameters

Which of the following is a valid way to create a route handler in Express.js?

• A) app.route('/users').get(handlerFunction)
• B) app.get('/users', handlerFunction)
• C) Both A and B
• D) None of the above

Answer: C) Both A and B

What does the app.use() function do in Express.js?

• A) Declares a new route handler
• B) Specifies middleware functions to be executed for every request
• C) Sets up a static file server
• D) Starts the Express.js application

Answer: B) Specifies middleware functions to be executed for every request

What is the purpose of the req.query object in Express.js?

• A) To access request query parameters
• B) To access request headers
• C) To access URL route parameters
• D) To access request body parameters

Answer: A) To access request query parameters

Which of the following HTTP methods is used to update an existing resource in a RESTful API?

• A) GET
• B) POST
• C) PUT
• D) DELETE

Answer: C) PUT

In Express.js, what is the purpose of the res.json() method?

• A) To send an HTTP response with JSON data
• B) To redirect the client to a new URL
• C) To send an HTTP response with HTML content
• D) To render a view template

Answer: A) To send an HTTP response with JSON data

What is the purpose of the app.listen() function in Express.js?

• A) To start the Express.js application
• B) To create a new route handler
• C) To specify middleware functions
• D) To set up a static file server

Answer: A) To start the Express.js application