Top 40 Koa.js Multiple Choice Questions (MCQs) with Answers

1 .

Koa.js is a ________web framework for.

A)

Node

B)

React

C)

Python

D)

JavaScript

Correct Answer : Node

Explanation : KoaJs is next generation web framework for node.js

2 .

Is Koa.js open-source?

A)

Yes

B)

No

C)

Can Not Say

D)

None of the above

Correct Answer : Yes

Explanation : Yes, Koa.js is an open-source framework.

3 .

Which of the following Sets a new cookie or updates an existing cookie?

A)

ctx.set()

B)

cookies.set()

C)

set.cookies()

D)

ctx.cookies.set()

Correct Answer : ctx.cookies.set()

Explanation : ctx.cookies.set(), Sets a new cookie, or updates an existing cookie.

4 .

How many arguments does ctx.cookies.set() takes?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 3

Explanation : ctx.cookies.set(), takes three required arguments i.e., name, value, and one optional argument.

5 .

Which of the following is a routing package that makes it simple to handle URL routes and HTTP methods?

A)

Routes

B)

Route.Koa

C)

Koa-router

D)

Node-router

Correct Answer : Koa-router

Explanation : Koa-router is a routing package that makes it simple to handle URL routes and HTTP methods.

6 .

______ are a technique for constructing asynchronous code that seems to be synchronous code.

A)

Constructor

B)

Generators

C)

Middleware

D)

None of the above

Correct Answer : Generators

Explanation : Generators are a technique for constructing asynchronous code that seems to be synchronous code.

7 .

Which of the following is used to get the value of a cookie based on its name?

A)

ctx.cookies.get()

B)

ctx.cookies.set()

C)

ctx.cookies.obtain()

D)

All of the above

Correct Answer : ctx.cookies.get()

Explanation : ctx.cookies.get() used to get the value of a cookie based on its name.

8 .

How many arguments does ctx.cookies.get() takes?

A)

4

B)

3

C)

2

D)

1

Correct Answer : 1

Explanation : ctx.cookies.get() takes only one argument, i.e., the name of the cookie.

9 .

In a Koa.js application, ____ middleware is used to handle basic authentication.

A)

koa-jwt

B)

koa-auth

C)

koa-basic-auth

D)

koa-authorization

Correct Answer : koa-basic-auth

Explanation : In a Koa.js application, koa-basic-auth middleware is used to handle basic authentication.

10 .

Which of the following methods is used to determine if a user is authenticated?

A)

ctx.isAuthenticated()

B)

obj.isAuthenticated()

C)

app.isAuthenticated()

D)

session.isAuthenticated()

Correct Answer : ctx.isAuthenticated()

Explanation : ctx.isAuthenticated() method is used to determine if a user is authenticated.

11 .

Koa.js uses ____ to handle middleware functions.

A)

Classes

B)

Generators

C)

Objects

D)

Models

Correct Answer : Generators

Explanation : Koa.js uses generators to handle middleware functions.

12 .

Which of the following is a Middleware that parses incoming request bodies, making form data and JSON payloads accessible?

A)

koa-static

B)

koa-logger

C)

koa-bodyparser

D)

None of the above

Correct Answer : koa-bodyparser

Explanation : koa-bodyparser is a Middleware that parses incoming request bodies, making form data and JSON payloads accessible.

13 .

Which of the following request technique is used to partially update existing server resources?

A)

GET

B)

POST

C)

OPTIONS

D)

PATCH

Correct Answer : PATCH

Explanation : PATCH request technique is used to partially update existing server resources.

14 .

Which of the following request method is used to remove existing server resources?

A)

GET

B)

POST

C)

REMOVE

D)

DELETE

Correct Answer : DELETE

Explanation : The DELETE request method is used to remove existing server resources.

15 .

Data is submitted to the server using ____ method.

A)

GET

B)

POST

C)

PUT

D)

PATCH

Correct Answer : POST

Explanation : Data is submitted to the server using the POST method.

16 .

Which of the following request method used to obtain information from a server?

A)

GET

B)

POST

C)

PUT

D)

PATCH

Correct Answer : GET

Explanation : GET method is used to obtain information from a server.

17 .

With the help of which property response status is configured?

A)

Status.res

B)

Res.status

C)

Response.status

D)

Status.response

Correct Answer : Response.status

Explanation : The response status is configured using the Response.status property.

18 .

____ property is used to obtain the application's environment.

A)

Env.app

B)

App.env

C)

App.environment

D)

None of the above

Correct Answer : App.env

Explanation : app.env property is used to obtain the application's environment.

19 .

Which of the following methods is used to validate a user's credentials?

A)

is.authenticate()

B)

app.authenticate()

C)

User. ctx.authenticate()

D)

ctx.authenticate()

Correct Answer : ctx.authenticate()

Explanation : ctx.authenticate() method is used to validate a user's credentials.

20 .

_____ is a technique used to minimize the amount of data delivered over the network, which can enhance web application speed.

A)

Compression

B)

Generator

C)

Lowerity

D)

Application_speed

Correct Answer : Compression

Explaination : Compression is a technique used to minimize the amount of data delivered over the network, which can enhance web application speed.

21 .

Which of the following middleware is used to compress the response body before sending it to the client?

A)

Koa.compress

B)

Koa.compression

C)

Koa.compression.app

D)

None of the above

Correct Answer : Koa.compress

Explanation : koa.compress middleware is used to compress the response body prior to sending it to the client.

22 .

_______ is the practice of saving reusable replies to speed up later queries.

A)

Generator

B)

Compression

C)

Caching

D)

QueryGenrator

Correct Answer : Caching

Explanation : Caching is the practice of saving reusable replies to speed up later queries.

23 .

____ technique is used to deal with errors in the program.

A)

error.one

B)

app.onerror(err)

C)

app.error(one)

D)

All of the above

Correct Answer : app.onerror(err)

Explanation : app.onerror(err) technique is used to deal with errors in the programme.

24 .

Koa.js makes use of a single object known as the ______.

A)

AppObj

B)

Context

C)

Conject

D)

Single_obj

Correct Answer : Context

Explanation : Koa.js makes use of a single object known as the context.

25 .

The ____ middleware is used on the client side to cache server answers.

A)

Koa-cache

B)

Koa-basic-cache

C)

Koa-static-cache

D)

None of the above

Correct Answer : Koa-static-cache

Explanation : The koa-static-cache middleware is used on the client side to cache server answers.

26 .

Which of the following databases can be used with koa.js?

A)

Redis

B)

SQLite

C)

MySQL

D)

All of the above

Correct Answer : All of the above

Explanation : Koa.js uses a variety of data including :

* Redis
* SQLite
* MySQL
* MongoDB

27 .

Suppose you want to use PostgreSQL in koa.js then which of the following library you will use?

A)

pg

B)

pgs

C)

Post.sql

D)

Postgresql

Correct Answer : pg

Explanation : pg library is used if we want to use PostgreSQL in koa.js.

28 .

Suppose you want to use Redis in koa.js then which of the following library you will use?

A)

R

B)

Redis

C)

ioredis

D)

Redisdb

Correct Answer : ioredis

Explanation : ioredis library is used if we want to use Redis in koa.js.

29 .

Mounting middleware functions to the Koa application is accomplished using ____ function.

A)

Middleware.app

B)

app.use(middleware)

C)

app.middleware(name)

D)

None of the above

Correct Answer : app.use(middleware)

Explanation : Mounting middleware functions to the Koa application is accomplished using app.use(middleware).

30 .

Which of the following function launches the Koa application and listens for incoming HTTP requests?

A)

app.listen(port)

B)

app.port

C)

Listen.port

D)

app.port(listen)

Correct Answer : app.listen(port)

Explanation : app.listen(port) function launches the Koa application and listens for incoming HTTP requests.

31 .

JSON Web Tokens (JWT) authentication is handled through ____ middleware.

A)

koa-jwt

B)

Jwt.middleware

C)

app.jwt.middleware

D)

None of the above

Correct Answer : koa-jwt

Explanation : koa-jwt JSON Web Tokens (JWT) authentication is handled through middleware.

32 .

_______ middleware for session management.

A)

app.session

B)

koa.app.session

C)

session.middleware

D)

koa.session

Correct Answer : koa.session

Explanation : koa.session middleware for session management.

33 .

Which of the following technique is used to determine the value of a cookie based on its name?

A)

ctx.get

B)

ctx.cookies.get

C)

cookies.get.ctx

D)

All of the above

Correct Answer : ctx.cookies.get

Explanation : ctx.cookies.get technique is used to determine the value of a cookie based on its name.

34 .

Suppose you want to use MongoDB in koa.js then which of the following library you will use.

A)

MDB

B)

Mongose

C)

Mongoose

D)

MongoDB

Correct Answer : Mongoose

Explanation : The mongoose library is used if we want to use MongoDB in koa.js.

35 .

________ enables us to quickly build a skeleton for a web application.

A)

Presenter

B)

Generator

C)

Scaffolding

D)

Compression

Correct Answer : Scaffolding

Explanation : Scaffolding enables us to quickly build a skeleton for a web application.

36 .

How many arguments does ctx.cookies.get function takes?

A)

2

B)

3

C)

4

D)

5

Correct Answer : 2

Explanation : It accepts two arguments: the cookie's name and options.

37 .

Which of the following templating engines can be used with Koa.js?

A)

EJS

B)

PUG

C)

MUSTACHE

D)

All of the above

Correct Answer : All of the above

Explanation : Following templating engines can be used with Koa.js :

* EJS
* PUG
* MUSTACHE
* HANDLEBARS

38 .

_______ Middleware makes it simple to manage file uploads and parse request bodies.

A)

body

B)

koa-body

C)

app.body

D)

None of the above

Correct Answer : koa-body

Explanation : koa-body Middleware makes it simple to manage file uploads and parse request bodies.

39 .

______ is a data validation middleware that allows you to validate request data.

A)

koa-validate

B)

koa-validation

C)

koa-validator

D)

None of the above

Correct Answer : koa-validator

Explanation : koa-validator is a data validation middleware that allows you to validate request data.

40 .

Which of the following are the alternatives of koa.js?

A)

Hapi.js

B)

Fastify.js

C)

Express.js

D)

All of the above

Correct Answer : All of the above

Explanation : Following are the alternatives of Koa.js :

* Hapi.js
* Fastify.js
* Express.js

41 .

Which of the following companies uses Koa?

A)

Netflix

B)

Xiaomi

C)

Alibaba

D)

All of the above

Correct Answer : All of the above

Explanation : Following companies use Koa.js :

* Netflix
* Xiaomi
* Alibaba

42 .

______ middleware used to render views with template engines.

A)

Koa-views

B)

App.views

C)

View.middleware

D)

None of the above

Correct Answer : Koa-views

Explanation : Koa-views middleware is used to render views with template engines.

43 .

____ are basic, short files/data that are given to the client in conjunction with a server request and saved on the client side.

A)

Session

B)

Cookies

C)

Objects

D)

All of the above

Correct Answer : Cookies

Explanation : Cookies are basic, short files/data that are given to the client in conjunction with a server request and saved on the client side.

44 .

______ in Koa.js refers to the sequence in which middleware functions are run.

A)

Sequel

B)

Presenter

C)

Cascading

D)

None of the above

Correct Answer : Cascading

Explanation : Cascading in Koa.js refers to the sequence in which middleware functions are run.

45 .

Which of the following property is used to specify the keys that will be used to sign and verify cookies?

A)

App.keys

B)

Key.set

C)

Keys.get

D)

Session.key.get

Correct Answer : App.keys

Explanation : app.keys, property is used to specify the keys that will be used to sign and verify cookies.