Next.js Quiz ( Beginner ) - All Questions

This easy-level Next.js quiz is designed for beginners who want to test and strengthen their fundamentals. It covers core concepts like routing, rendering, components, and basic features of Next.js in a clear, interview-friendly way.

Question 1: What is Next.js primarily used for?

Building mobile applications
Building React applications with advanced features
Database management
Game development

Explanation: Next.js is a React framework that adds features like routing, SSR, and performance optimizations.

Question 2: Next.js is built on top of which library?

Vue
Angular
React
Svelte

Explanation: Next.js extends React to provide a full-stack framework.

Question 3: Which folder is responsible for routing in traditional Next.js projects?

components
routes
pages
public

Explanation: The pages folder automatically maps files to routes.

Question 4: What route is created by a file named index.js inside the pages folder?

/home
/index
/
/pages

Explanation: index.js inside pages maps to the root route (/).

Question 5: Which command starts the Next.js development server?

npm start
npm run build
npm run dev
next build

Explanation: npm run dev starts the development server in Next.js.

Question 6: What is the default port for a Next.js development server?

8080
3000
4200
5000

Explanation: Next.js runs on port 3000 by default.

Question 7: Which rendering methods are supported by Next.js?

Only client-side rendering
Only server-side rendering
Only static generation
Client-side, server-side, and static generation

Explanation: Next.js supports CSR, SSR, and SSG.

Question 8: Which file is used to customize the root component in Next.js?

_document.js
_app.js
index.js
main.js

Explanation: _app.js allows customization of the root React component.

Question 9: What is the purpose of the Link component in Next.js?

To refresh the page
To navigate using client-side routing
To fetch data
To style links

Explanation: Link enables fast client-side navigation between pages.

Question 10: Which hook is used to access routing information in Next.js?

useHistory
useRoute
useRouter
usePath

Explanation: useRouter provides access to route details in Next.js.

Question 11: Which file allows you to customize the HTML document structure?

_app.js
_html.js
_document.js
index.html

Explanation: _document.js customizes the HTML and body structure.

Question 12: What does Static Site Generation (SSG) mean in Next.js?

Pages generated on every request
Pages generated in the browser
Pages generated at build time
Pages generated using APIs only

Explanation: SSG generates pages at build time for better performance.

Question 13: Which function is used for static generation with data?

getServerSideProps
getStaticProps
getInitialProps
useEffect

Explanation: getStaticProps fetches data at build time.

Question 14: Which function enables server-side rendering in Next.js?

getStaticProps
getClientSideProps
getServerSideProps
useState

Explanation: getServerSideProps runs on each request on the server.

Question 15: Where should API routes be placed in Next.js?

api folder
server folder
pages/api folder
backend folder

Explanation: API routes are created inside the pages/api directory.

Question 16: Next.js API routes run on which side?

Client side
Server side
Browser only
CDN only

Explanation: API routes execute on the server.

Question 17: Which component is recommended for images in Next.js?

img
picture
Image from next/image
Media

Explanation: The Image component provides automatic optimization.

Question 18: What is the purpose of the public folder in Next.js?

To store components
To store static assets
To store routes
To store APIs

Explanation: The public folder stores static files like images and icons.

Question 19: Which file contains custom Next.js configuration?

package.json
next.config.js
config.json
webpack.js

Explanation: next.config.js is used to customize Next.js behavior.

Question 20: What does SSR stand for in Next.js?

Static Site Rendering
Server Side Rendering
Secure Site Rendering
System Side Rendering

Explanation: SSR means Server Side Rendering.

Question 21: Which command is used to build a Next.js app for production?

npm run dev
next start
npm run build
npm install

Explanation: npm run build creates an optimized production build.

Question 22: What is the purpose of next/head?

To add scripts
To manage API calls
To modify the HTML head
To manage routing

Explanation: next/head allows modifying meta tags and title.

Question 23: Which feature helps Next.js improve SEO?

Client-only rendering
Server-side rendering
Inline styling
Local storage

Explanation: Server-side rendering helps search engines index pages.

Question 24: What happens when you add a new file in the pages folder?

It creates a new component only
It creates a new API
It automatically becomes a route
It causes an error

Explanation: Each file in pages maps to a route.

Question 25: Which extension is commonly used for Next.js pages?

.html
.ts
.js or .jsx
.json

Explanation: Next.js pages are usually written in .js or .jsx.

Question 26: What does hydration mean in Next.js?

Fetching data from API
Adding CSS styles
Attaching React to server-rendered HTML
Deploying the app

Explanation: Hydration connects React to server-rendered HTML.

Question 27: Which company created Next.js?

Google
Meta
Vercel
Microsoft

Explanation: Next.js was created by Vercel.

Question 28: What is the main benefit of file-based routing?

Manual configuration
Better security
Automatic route creation
Smaller bundle size

Explanation: File-based routing automatically creates routes.

Question 29: Which lifecycle is commonly used for data fetching in Next.js pages?

componentDidMount
useEffect
getStaticProps or getServerSideProps
render

Explanation: Next.js provides dedicated data-fetching functions.

Question 30: Which environment is Next.js suitable for?

Frontend only
Backend only
Full-stack applications
Mobile apps only

Explanation: Next.js supports both frontend and backend features.

Question 31: What is the purpose of next/router?

Styling pages
Managing API calls
Handling navigation programmatically
Optimizing images

Explanation: next/router allows programmatic navigation.

Question 32: Which folder is NOT required in a basic Next.js app?

pages
public
node_modules
controllers

Explanation: controllers is not part of a default Next.js structure.

Question 33: What type of application is Next.js best suited for?

Static and dynamic web apps
Desktop applications
Embedded systems
CLI tools

Explanation: Next.js is designed for modern web applications.

Question 34: Which command is used to start Next.js in production mode?

npm run dev
next start
npm install
next build

Explanation: next start runs the production server.

Question 35: What is automatic code splitting in Next.js?

Splitting CSS files
Loading only required JavaScript per page
Removing unused code
Compressing images

Explanation: Next.js loads only the JavaScript needed for each page.

Question 36: Which feature improves performance in Next.js?

Image optimization
Manual routing
Inline scripts
Hard reloads

Explanation: Image optimization improves performance significantly.

Question 37: Which hook is commonly used for side effects in Next.js components?

useState
useEffect
useRouter
useMemo

Explanation: useEffect handles side effects in React and Next.js.

Question 38: What is the role of React in Next.js?

It replaces Next.js
It provides UI components
It handles database operations
It manages servers

Explanation: React is used for building the UI in Next.js.

Question 39: Which file runs before rendering every page?

_document.js
_app.js
index.js
layout.js

Explanation: _app.js wraps all pages in Next.js.

Question 40: Which statement best describes Next.js?

A CSS framework
A backend-only framework
A React framework for production apps
A database tool

Explanation: Next.js is a production-ready React framework.

Question 41: What is the main advantage of SSR in Next.js?

Faster builds
Better SEO and initial load
Smaller images
Simpler syntax

Explanation: SSR improves SEO and first-page load time.

Question 42: Which keyword is used to export a page component?

module.exports
export default
exports.page
default export

Explanation: Pages must be exported as default exports.

Question 43: What does Next.js use instead of react-router?

Manual routing
File-based routing
Hash routing
Memory routing

Explanation: Next.js uses file-based routing instead of react-router.

Question 44: Which folder contains third-party dependencies?

public
pages
node_modules
lib

Explanation: node_modules stores installed dependencies.

Question 45: What is incremental static regeneration related to?

Client-side rendering
Updating static pages after build
API routes
Image loading

Explanation: ISR allows updating static pages after deployment.

Question 46: Which statement about Next.js is true?

It cannot be used with APIs
It only supports SSR
It supports both frontend and backend logic
It replaces React completely

Explanation: Next.js supports full-stack development.

Question 47: What is the main goal of Next.js?

Simplify React app development for production
Replace JavaScript
Build mobile apps
Create databases

Explanation: Next.js aims to simplify building production-ready React apps.

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Next.js Quiz ( Beginner )