Express.js Middleware Explained MCQ | Express.js Middleware Multiple Choice Questions

Direction: Choose the correct option

What is middleware in Express.js?

A. A database connection library

B. A function that has access to the request and response objects

C. A routing method

D. A template engine

Direction: Choose the correct option

Which arguments are passed to a standard middleware function?

A. req, next, next

B. req, res

C. err, req, res, next

D. req, res, next

Direction: Choose the correct option

What does the next() function do in middleware?

A. It throws an error

B. It sends a response

C. It passes control to the next middleware or route handler

D. It ends the request-response cycle

Direction: Choose the correct option

If a middleware does not call next() or send a response, what happens?

A. The server crashes

B. The request hangs and times out

C. An error is thrown

D. The next middleware is called automatically

Direction: Choose the correct option

Which of the following is an example of built-in middleware in Express 4.x?

A. express.logger()

B. express.bodyParser()

C. express.session()

D. express.json()

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