Node JS MCQs - 9

Which of the following Express.js methods is used to handle HTTP OPTIONS requests?

• A) app.options()
• B) app.get()
• C) app.post()
• D) app.delete()

Answer: A) app.options()

What is the purpose of the express.static() middleware in Express.js?

• A) To serve static files such as HTML, CSS, and JavaScript
• B) To handle authentication
• C) To manage session data
• D) To handle routing logic

Answer: A) To serve static files such as HTML, CSS, and JavaScript

Which of the following is a common task performed by middleware in Express.js?

• A) Defining routes
• B) Authenticating users
• C) Rendering views
• D) Parsing JSON data

Answer: D) Parsing JSON data

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

• A) To send an HTTP response with JSON data
• B) To set cookies in the client's browser
• C) To delete a cookie from the client's browser
• D) To send a file as an attachment in the HTTP response

Answer: C) To delete a cookie from the client's browser

In Express.js, what is the purpose of the req.protocol property?

• A) To access the request method
• B) To access the request headers
• C) To access the request URL
• D) To access the request protocol (HTTP or HTTPS)

Answer: D) To access the request protocol (HTTP or HTTPS)

Which of the following Express.js methods is used to handle HTTP HEAD requests?

• A) app.head()
• B) app.get()
• C) app.post()
• D) app.delete()

Answer: A) app.head()

What is the purpose of middleware chaining in Express.js?

• A) To execute middleware in a specific order
• B) To combine multiple middleware functions into one
• C) To handle routing logic
• D) To manage session data

Answer: A) To execute middleware in a specific order

Which of the following Express.js methods is used to define middleware that is only executed for a specific HTTP method and route?

• A) app.use()
• B) app.route()
• C) router.use()
• D) router.route()

Answer: B) app.route()

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

• A) To set the HTTP status code of the response
• B) To set response headers
• C) To send an HTTP response with JSON data
• D) To send an HTTP response with HTML content

Answer: B) To set response headers

In Express.js, what does the req.route property contain?

• A) The request method
• B) The request headers
• C) The route parameters
• D) The route object

Answer: D) The route object