Your First Express Server MCQ | Express.js Server Multiple Choice Questions

Direction: Choose the correct option

What is the minimal code to create a simple Express server that responds with 'Hello World' at the root?

A. const express = require('express'); const app = express(); app.use('/', (req, res) => res.send('Hello World')); app.listen(3000);

B. const express = require('express'); const app = express(); app.get('/', (req, res) => res.send('Hello World')); app.listen(3000);

C. const express = require('express'); express().get('/', (req, res) => res.send('Hello World')).listen(3000);

D. const app = express(); app.get('/', (req, res) => res.send('Hello World')); app.listen(3000);

Direction: Choose the correct option

In the callback of app.get('/', (req, res) => { ... }), what do req and res represent?

A. Query and result

B. Router and server

C. Request and response objects

D. Input and output

Direction: Choose the correct option

What happens if you do not call any method like res.send() in a route handler?

A. An error is thrown

B. The next middleware is called automatically

C. The request hangs and eventually times out

D. The server sends a default response

Direction: Choose the correct option

How can you make your server listen on a dynamic port (e.g., from environment variables)?

A. app.listen(3000);

B. app.listen(process.env.PORT);

C. app.listen(env.PORT);

D. const port = process.env.PORT || 3000; app.listen(port);

Direction: Choose the correct option

Which method is used to log a message when the server starts listening?

A. app.start(3000, () => console.log('Server running'));

B. Both A and B

C. app.on('listening', () => console.log('Server running'));

D. app.listen(3000, () => console.log('Server running'));

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