Express JS Express Middleware 2

Question 1

Which built-in Express middleware parses URL-encoded form data?

Accepted Answer

express.urlencoded()

Answer

express.formData()

Answer

express.form()

Answer

express.parseForm()

Question 2

What is the signature of an Express error-handling middleware?

Accepted Answer

(err, req, res, next)

Answer

(req, res, next, err)

Answer

(err, req, res)

Answer

(error, request, response, callback)

Question 3

Which popular third-party middleware is used for logging HTTP requests in Express?

Accepted Answer

morgan

Answer

winston

Answer

bunyan

Answer

log4js

Question 4

What does the 'cors' middleware package primarily do in an Express app?

Accepted Answer

Enables Cross-Origin Resource Sharing by setting appropriate HTTP headers

Answer

Compresses response bodies

Answer

Parses cookies

Answer

Handles authentication

Question 5

How do you invoke the next error-handling middleware from a route by passing an error?

Accepted Answer

next(err) with an error object or string

Answer

throw err

Answer

res.error(err)

Answer

next.error(err)

Question 6

What does passing the string 'route' to next() do in Express?

Accepted Answer

Skips remaining handlers for the current route and moves to the next route

Answer

Redirects to a named route

Answer

Throws a routing error

Answer

Ends the middleware chain