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Koa.js Multiple-Choice Questions (MCQs)

Koa.js is an open-source, minimal, and flexible Node.js web framework developed by the creators of Express.js.

Koa.js MCQs: This section contains multiple-choice questions and answers on the various topics of Koa.js. Practice these MCQs to test and enhance your skills on Koa.js.

List of Koa.js MCQs

1. Koa.js is a web framework for ____.

  1. JavaScript
  2. Python
  3. Node
  4. React

Answer: C) Node

Explanation:

Koa.js is a web framework for node.js.

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2. Is Koa.js open-source?

  1. Yes
  2. No

Answer: A) Yes

Explanation:

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

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

  1. Route.Koa
  2. Koa-router
  3. Routes
  4. Node-router

Answer: B) Koa-router

Explanation:

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

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

  1. Generators
  2. Middleware
  3. Constructor

Answer: A) Generators

Explanation:

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

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5. Koa.js uses ____ to handle middleware functions.

  1. Objects
  2. Classes
  3. Generators
  4. Models

Answer: C) Generators

Explanation:

Koa.js uses generators to handle middleware functions.

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

  1. koa-bodyparser
  2. koa-logger
  3. koa-static

Answer: A) koa-bodyparser

Explanation:

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

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

  1. GET
  2. POST
  3. PATCH
  4. OPTIONS

Answer: C) PATCH

Explanation:

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

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

  1. GET
  2. POST
  3. REMOVE
  4. DEL
  5. DELETE

Answer: E) DELETE

Explanation:

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

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9. Data is submitted to the server using ____ method.

  1. GET
  2. POST
  3. PATCH
  4. PUT

Answer: B) POST

Explanation:

Data is submitted to the server using the POST method.

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

  1. GET
  2. POST
  3. PATCH
  4. PUT

Answer: A) GET

Explanation:

GET method is used to obtain information from a server.

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11. With the help of which property response status is configured?

  1. Status.res
  2. Res.status
  3. Response.status
  4. Status.response

Answer: C) Response.status

Explanation:

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

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

  1. App.environment
  2. App.env
  3. Env.app

Answer: B) App.env

Explanation:

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

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

  1. app.onerror(err)
  2. error.one
  3. app.error(one)

Answer: A) app.onerror(err)

Explanation:

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

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

  1. Context
  2. AppObj
  3. Conject
  4. Single_obj

Answer: A) Context

Explanation:

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

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

  1. Middleware.app
  2. app.middleware(name)
  3. app.use(middleware)

Answer: C) app.use(middleware)

Explanation:

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

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

  1. app.port
  2. Listen.port
  3. app.port(listen)
  4. app.listen(port)

Answer: D) app.listen(port)

Explanation:

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

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

  1. Jwt.middleware
  2. koa-jwt
  3. app.jwt.middleware

Answer: B) koa-jwt

Explanation:

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

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18. ____ middleware for session management.

  1. koa.session
  2. app.session
  3. koa.app.session
  4. session.middleware

Answer: A) koa.session

Explanation:

koa.session middleware for session management.

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

  1. ctx.get
  2. ctx.cookies.get
  3. cookies.get.ctx

Answer: B) ctx.cookies.get

Explanation:

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

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

  1. 5
  2. 4
  3. 3
  4. 2

Answer: D) 2

Explanation:

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

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

  1. EJS
  2. PUG
  3. MUSTACHE
  4. HANDLEBARS
  5. All of the above

Answer: E) All of the above

Explanation:

Following templating engines can be used with Koa.js:

  • EJS
  • PUG
  • MUSTACHE
  • HANDLEBARS

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

  1. body
  2. koa-body
  3. app.body

Answer: B) koa-body

Explanation:

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

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23. ____ middleware used to render views with template engines.

  1. App.views
  2. View.middleware
  3. Koa-views

Answer: C) Koa-views

Explanation:

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

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

  1. Objects
  2. Cookies
  3. Session

Answer: B) 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.

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

  1. ctx.cookies.set()
  2. ctx.set()
  3. cookies.set()
  4. set.cookies()

Answer: A) ctx.cookies.set()

Explanation:

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

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

  1. 3
  2. 4
  3. 5
  4. 2

Answer: A) 3

Explanation:

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

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

  1. ctx.cookies.obtain()
  2. ctx.cookies.set()
  3. ctx.cookies.get()

Answer: C) ctx.cookies.get()

Explanation:

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

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

  1. 4
  2. 3
  3. 2
  4. 1

Answer: D) 1

Explanation:

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

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

  1. koa-basic-auth
  2. koa-auth
  3. koa-authorization
  4. koa-jwt

Answer: A) koa-basic-auth

Explanation:

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

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

  1. session.isAuthenticated()
  2. ctx.isAuthenticated()
  3. app.isAuthenticated()
  4. obj.isAuthenticated()

Answer: B) ctx.isAuthenticated()

Explanation:

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

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

  1. app.authenticate()
  2. User. ctx.authenticate()
  3. is.authenticate()
  4. ctx.authenticate()

Answer: D) ctx.authenticate()

Explanation:

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

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

  1. Generator
  2. Compression
  3. Application_speed
  4. Lowerity

Answer: B) Compression

Explanation:

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

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

  1. Koa.compression
  2. Koa.compress
  3. Koa.compression.app

Answer: B) Koa.compress

Explanation:

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

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

  1. QueryGenrator
  2. Generator
  3. Caching
  4. Compression

Answer: C) Caching

Explanation:

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

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

  1. Koa-static-cache
  2. Koa-cache
  3. Koa-basic-cache

Answer: A) Koa-static-cache

Explanation:

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

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

  1. Redis
  2. SQLite
  3. MySQL
  4. MongoDB
  5. All of the above

Answer: E) All of the above

Explanation:

Koa.js uses a variety of data including:

  • Redis
  • SQLite
  • MySQL
  • MongoDB

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

  1. Post.sql
  2. pg
  3. Postgresql
  4. pgs

Answer: B) pg

Explanation:

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

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

  1. R
  2. Redis
  3. Redisdb
  4. ioredis

Answer: D) ioredis

Explanation:

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

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

  1. MongoDB
  2. Mongoose
  3. Mongose
  4. MDB

Answer: B) Mongoose

Explanation:

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

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40. ____ enables us to quickly build a skeleton for a web application.

  1. Scaffolding
  2. Compression
  3. Generator
  4. Presenter

Answer: A) Scaffolding

Explanation:

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

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

  1. koa-validator
  2. koa-validate
  3. koa-validation

Answer: A) koa-validator

Explanation:

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

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

  1. Session.key.get
  2. Keys.get
  3. Key.set
  4. App.keys

Answer: D) App.keys

Explanation:

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

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

  1. Cascading
  2. Presenter
  3. Sequel

Answer: A) Cascading

Explanation:

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

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44. Which of the following companies uses Koa?

  1. Netflix
  2. Alibaba
  3. Xiaomi
  4. All of the above

Answer: D) All of the above

Explanation:

Following companies use Koa.js:

  • Netflix
  • Alibaba
  • Xiaomi

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

  1. Express.js
  2. Hapi.js
  3. Fastify.js
  4. All of the above

Answer: D) All of the above

Explanation:

Following are the alternatives of Koa.js:

  • Express.js
  • Hapi.js
  • Fastify.js

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