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

Direction: Choose the correct option

How do you create a custom middleware function that logs each request?

A. app.log((req) => console.log(req))

B. app.use((req, res, next) => { console.log('Request'); next(); })

C. app.middleware(logger)

D. app.use(logger())

Direction: Choose the correct option

What is the role of the body-parser middleware (now part of Express)?

A. To enable CORS

B. To parse incoming request bodies

C. To parse cookies

D. To compress responses

Direction: Choose the correct option

Why would you use the cors middleware in an Express app?

A. To enable Cross-Origin Resource Sharing

B. To handle errors

C. To compress responses

D. To log requests

Direction: Choose the correct option

How do you include third-party middleware like morgan for logging?

A. require('morgan') and app.get(morgan)

B. npm install morgan then app.use(morgan('tiny'))

C. Both A and B

D. npm install morgan then app.use(morgan)

Direction: Choose the correct option

What does the following custom middleware do? app.use((req, res, next) => { req.requestTime = Date.now(); next(); })

A. Sends a response

B. Adds a requestTime property to the request object

C. Ends the request

D. Logs the request time

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