1 $Which built-in Node.js module is primarily used to create a web server?$

A.

fs

B.

http

C.

url

D.

server

2 $Which method of the HTTP module is used to initialize a server?$

A.

http.initServer()

B.

http.createServer()

C.

http.startServer()

D.

http.newServer()

3 $What arguments does the request listener callback function in http.createServer() accept?$

A.

(request, response)

B.

(req, data)

C.

(response, error)

D.

(data, status)

4 $Which method is used to make the Node.js HTTP server accept connections on a specific port?$

A.

server.start()

B.

server.run()

C.

server.listen()

D.

server.bind()

5 $In a raw Node.js server, where is the request metadata (like headers and URL) stored?$

A.

In the response object

B.

In the global scope

C.

In the request object

D.

In the file system

6 $Which property of the request object holds the part of the URL after the domain name?$

A.

req.path

B.

req.url

C.

req.href

D.

req.link

7 $Which method is used to send a chunk of the response body in the native HTTP module?$

A.

res.send()

B.

res.write()

C.

res.push()

D.

res.log()

8 $What must be called to complete the response and send it to the client in the native HTTP module?$

A.

res.stop()

B.

res.finish()

C.

res.end()

D.

res.complete()

9 $How do you set the HTTP status code to 404 using the native response object?$

A.

res.code = 404

B.

res.statusCode = 404

C.

res.setStatus(404)

D.

res.status(404)

10 $Which method is used to write the status code and response headers simultaneously in native Node.js?$

A.

res.writeHead()

B.

res.setHeader()

C.

res.sendHeader()

D.

res.writeHeader()

11 $What is the correct HTTP status code for a successful request?$

A.

200

B.

201

C.

400

D.

500

12 $What is the correct HTTP status code for 'Internal Server Error'?$

A.

404

B.

500

C.

301

D.

403

13 $When sending JSON data using native Node.js, what should the 'Content-Type' header be set to?$

A.

text/html

B.

text/json

C.

application/json

D.

application/javascript

14 $How is basic routing typically implemented in a native Node.js HTTP server?$

A.

Using a router file

B.

Using if/else statements checking req.url

C.

Using switch/case on req.body

D.

It handles routing automatically

15 $Which HTTP method is used to request data from a specified resource?$

A.

POST

B.

PUT

C.

DELETE

D.

GET

16 $Which HTTP method is commonly used to submit data to be processed to a specified resource?$

A.

GET

B.

POST

C.

HEAD

D.

OPTIONS

17 $What is Express.js?$

A.

A database for Node.js

B.

A fast, unopinionated web framework for Node.js

C.

A front-end library

D.

A strict MVC framework

18 $Which command is used to install Express in a Node.js project?$

A.

node install express

B.

npm install express

C.

npm get express

D.

install express

19 $What is the first step to using Express in a file after installation?$

A.

const app = express()

B.

require('express')

C.

import express from 'node'

D.

start express

20 $How do you initialize an Express application?$

A.

const app = new Express()

B.

const app = express()

C.

const app = createApplication()

D.

const app = start()

21 $Which Express method is used to handle GET requests?$

A.

app.fetch()

B.

app.retrieve()

C.

app.get()

D.

app.read()

22 $In Express, what method is used to send a response and automatically set the Content-Type?$

A.

res.write()

B.

res.send()

C.

res.emit()

D.

res.dispatch()

23 $How do you access route parameters (e.g., /users/:id) in Express?$

A.

req.query

B.

req.body

C.

req.params

D.

req.route

24 $How do you access query string parameters (e.g., ?search=term) in Express?$

A.

req.params

B.

req.query

C.

req.search

D.

req.url

25 $Which Express method starts the server listening for connections?$

A.

app.run()

B.

app.listen()

C.

app.start()

D.

app.init()

26 $What is the purpose of 'body-parser' middleware?$

A.

To parse the URL

B.

To validate the response

C.

To parse incoming request bodies

D.

To send JSON data

27 $Before Express 4.16.0, body-parser was a separate install. How do you access JSON parsing now in modern Express?$

A.

express.body()

B.

express.json()

C.

express.parse()

D.

It is not supported

28 $Which middleware parses incoming requests with URL-encoded payloads?$

A.

express.urlencoded()

B.

express.text()

C.

express.raw()

D.

express.form()

29 $If body-parser is not used, what is the value of req.body for a POST request in Express by default?$

A.

null

B.

undefined

C.

An empty object {}

D.

An empty string

30 $What does the extended: true option in urlencoded() middleware do?$

A.

Allows parsing of rich objects and arrays

B.

Enables HTTPS

C.

Increases the body size limit

D.

Parses XML data

31 $What is express.Router used for?$

A.

To connect to the internet

B.

To create modular, mountable route handlers

C.

To route data to the database

D.

To handle static files

32 $How do you expose a router defined in a separate file?$

A.

exports.router = router

B.

module.exports = router

C.

return router

D.

export default router

33 $How do you mount a router module in the main app file?$

A.

app.add(router)

B.

app.use(router)

C.

app.route(router)

D.

app.mount(router)

34 $If you mount a router at '/api', and the router has a route for '/users', what is the full path?$

A.

/users

B.

/api

C.

/api/users

D.

/users/api

35 $Which library is commonly used with Express for validating incoming request data?$

A.

express-check

B.

express-validator

C.

body-check

D.

node-validate

36 $In express-validator, which function is used to validate a field in the request body?$

A.

checkBody()

B.

body()

C.

validate()

D.

req.check()

37 $What does validationResult(req) return in express-validator?$

A.

Boolean true/false

B.

The sanitized body

C.

An object containing any validation errors

D.

The response object

38 $Which method in express-validator is used to check if a field is a valid email?$

A.

isEmail()

B.

checkEmail()

C.

validateEmail()

D.

isValidEmail()

39 $What is the purpose of sanitization in express-validator?$

A.

To reject invalid data

B.

To encrypt data

C.

To modify input data (e.g., trim whitespace)

D.

To log data

40 $Where do you place the validation middleware in an Express route definition?$

A.

Inside the callback function

B.

As an array of arguments before the callback

C.

In the app.listen() method

D.

In the package.json

41 $In express-validator, how do you check if the validation result contains errors?$

A.

errors.exist()

B.

errors.isEmpty()

C.

errors.hasErrors()

D.

errors.length > 0

42 $Which of the following matches a route path for ANY HTTP method in Express?$

A.

app.any()

B.

app.all()

C.

app.every()

D.

app.star()

43 $What is a 'middleware' in the context of Express?$

A.

Hardware drivers

B.

Functions that have access to req, res, and next

C.

The database layer

D.

The front-end framework

44 $What does the next argument represent in an Express middleware function?$

A.

The previous request

B.

The database connection

C.

A callback to pass control to the next middleware

D.

The error object

45 $Which status code indicates 'Bad Request' due to validation failure?$

A.

200

B.

400

C.

404

D.

503

46 $How do you chain multiple validators on the same field in express-validator?$

A.

body('field').isEmail().normalizeEmail()

B.

body('field', 'isEmail', 'normalizeEmail')

C.

validate('field', [isEmail, normalizeEmail])

D.

You cannot chain them

47 $In a native Node server, how do you differentiate between a POST and a GET request?$

A.

req.type

B.

req.method

C.

req.action

D.

req.verb

48 $What is the primary advantage of using Express over the native HTTP module?$

A.

It allows using Java

B.

It removes the need for JavaScript

C.

It simplifies routing and middleware management

D.

It is slower but more secure

49 $Which method allows you to serve static files (images, CSS) in Express?$

A.

express.static()

B.

express.files()

C.

express.public()

D.

express.assets()

50 $When setting a custom response header in Express, which method is used?$

A.

res.addHeader()

B.

res.set()

C.

res.put()

D.

res.config()

Unit 2 - Practice Quiz