Built-in Middleware MCQ | Express.js Built-in Middleware Multiple Choice Questions

Direction: Choose the correct option

What does express.json() middleware do?

A. Parses incoming requests with JSON payloads

B. Serves static files

C. Parses URL-encoded bodies

D. Handles cookies

Direction: Choose the correct option

What is the purpose of express.urlencoded({ extended: true })?

A. To parse URL-encoded bodies (form submissions)

B. To serve static files

C. To parse JSON

D. To enable CORS

Direction: Choose the correct option

What is the difference between extended: true and extended: false in express.urlencoded()?

A. true parses JSON, false parses URL-encoded

B. true is for arrays, false is for strings

C. true uses the qs library (allows nested objects), false uses the querystring library

D. true enables strict parsing

Direction: Choose the correct option

Which built-in middleware is used to serve static files like CSS and images?

A. express.public()

B. express.static()

C. express.file()

D. express.serve()

Direction: Choose the correct option

How do you use express.static to serve files from a 'public' folder?

A. app.static('public')

B. app.use(express.static('public'))

C. app.mount(express.static('public'))

D. app.get(express.static('public'))

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