50 Must-Know Next.js Interview Questions and Answers 2024

Next.js Fundamentals

1.
What is Next.js and what are its main features?
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2.
How does Next.js differ from Create React App?
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3.
What command is used to create a new Next.js app?
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4.
How does Next.js handle server-side rendering (SSR)?
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5.
Can you explain the purpose of the pages directory in a Next.js project?
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6.
In Next.js, how do you create a page that is rendered on the server for every request?
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7.
What file extensions does Next.js support for pages?
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8.
How do environment variables work in Next.js?
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9.
What is Automatic Static Optimization in Next.js?
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Pages and Routing

10.
How does file-based routing work in Next.js?
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11.
How do you create dynamic routes in Next.js?
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12.
Explain how to access URL parameters in a dynamic route.
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13.
Describe the functionality of the Link component in Next.js.
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14.
How do you handle catch-all routes in Next.js?
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Data Fetching and Rendering

15.
What is getStaticProps and when would you use it?
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16.
What is getServerSideProps and what kind of rendering does it enable?
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17.
How would you implement Incremental Static Regeneration (ISR) in Next.js?
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18.
Can you use client-side data fetching in Next.js? If so, how?
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19.
Explain the ‘fallback’ key used in the getStaticPaths function.
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API Routes

20.
How do you create an API route in Next.js?
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21.
Can you use middleware within Next.js API routes?
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22.
Explain how to handle query parameters in Next.js API routes.
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Styling in Next.js

23.
How can you include CSS modules in your Next.js application?
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24.
Compare and contrast CSS-in-JS and styled-components in the context of Next.js.
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25.
Can global styles be used in Next.js? If so, how?
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Performance Optimization

26.
What is the Image component and how does it help optimize performance in Next.js?
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27.
How does code splitting work in Next.js?
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28.
What are the methods provided by Next.js for prefetching pages?
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Deployment and Hosting

29.
What are the benefits of deploying a Next.js application to Vercel?
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30.
How do you configure custom domain names when deploying a Next.js application?
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31.
Explain how to deploy a Next.js app using a different hosting service, such as AWS or Netlify.
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Integrations and Plugins

32.
How do you integrate a CSS framework like Tailwind CSS into a Next.js project?
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33.
What are some popular plugins for Next.js and what functionalities do they add?
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34.
How do you enable TypeScript support in a Next.js project?
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Advanced Features

35.
How do you implement a custom server in Next.js and why would you do so?
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36.
What are the considerations when setting up internationalized routing in Next.js?
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37.
How do you handle custom error pages in a Next.js application?
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Best Practices

38.
What folder structure is recommended for large-scale Next.js applications?
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39.
How should you structure components in a Next.js application for optimal code reusability?
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40.
What are some security best practices you should follow in a Next.js app?
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State Management in Next.js

41.
How do you manage global state in a Next.js application without using external libraries?
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42.
When should you consider using a state management library like Redux in a Next.js project?
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43.
Explain how to persist state between page transitions in a Next.js app.
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Next.js and TypeScript

44.
What are the advantages of using TypeScript in a Next.js project?
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45.
How do you add type definitions for a Next.js page’s props?
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46.
What steps are involved in migrating an existing Next.js project to TypeScript?
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47.
Can you describe how to use TypeScript for defining API route handlers in Next.js?
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48.
How do you enforce type checking for dynamic routes in Next.js using TypeScript?
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49.
How does Next.js handle automatic type generation for pages and API routes when using TypeScript?
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50.
What is the role of the tsconfig.json file in a Next.js project with TypeScript, and how do you customize it for your specific needs?
Answer:

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50 Next.js interview questions

What is Next.js and what are its main features?

How does Next.js differ from Create React App?

What command is used to create a new Next.js app?

How does Next.js handle server-side rendering (SSR)?

Can you explain the purpose of the pages directory in a Next.js project?

In Next.js, how do you create a page that is rendered on the server for every request?

What file extensions does Next.js support for pages?

How do environment variables work in Next.js?

What is Automatic Static Optimization in Next.js?

How does file-based routing work in Next.js?

How do you create dynamic routes in Next.js?

Explain how to access URL parameters in a dynamic route.

Describe the functionality of the Link component in Next.js.

How do you handle catch-all routes in Next.js?

What is getStaticProps and when would you use it?

What is getServerSideProps and what kind of rendering does it enable?

How would you implement Incremental Static Regeneration (ISR) in Next.js?

Can you use client-side data fetching in Next.js? If so, how?

Explain the ‘fallback’ key used in the getStaticPaths function.

How do you create an API route in Next.js?

Can you use middleware within Next.js API routes?

Explain how to handle query parameters in Next.js API routes.

How can you include CSS modules in your Next.js application?

Compare and contrast CSS-in-JS and styled-components in the context of Next.js.

Can global styles be used in Next.js? If so, how?

What is the Image component and how does it help optimize performance in Next.js?

How does code splitting work in Next.js?

What are the methods provided by Next.js for prefetching pages?

What are the benefits of deploying a Next.js application to Vercel?

How do you configure custom domain names when deploying a Next.js application?

Explain how to deploy a Next.js app using a different hosting service, such as AWS or Netlify.

How do you integrate a CSS framework like Tailwind CSS into a Next.js project?

What are some popular plugins for Next.js and what functionalities do they add?

How do you enable TypeScript support in a Next.js project?

How do you implement a custom server in Next.js and why would you do so?

What are the considerations when setting up internationalized routing in Next.js?

How do you handle custom error pages in a Next.js application?

What folder structure is recommended for large-scale Next.js applications?

How should you structure components in a Next.js application for optimal code reusability?

What are some security best practices you should follow in a Next.js app?

How do you manage global state in a Next.js application without using external libraries?

When should you consider using a state management library like Redux in a Next.js project?

Explain how to persist state between page transitions in a Next.js app.

What are the advantages of using TypeScript in a Next.js project?

How do you add type definitions for a Next.js page’s props?

What steps are involved in migrating an existing Next.js project to TypeScript?

Can you describe how to use TypeScript for defining API route handlers in Next.js?

How do you enforce type checking for dynamic routes in Next.js using TypeScript?

How does Next.js handle automatic type generation for pages and API routes when using TypeScript?

What is the role of the tsconfig.json file in a Next.js project with TypeScript, and how do you customize it for your specific needs?

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Can you explain the purpose of the `pages` directory in a Next.js project?

Describe the functionality of the `Link` component in Next.js.

What is `getStaticProps` and when would you use it?

What is `getServerSideProps` and what kind of rendering does it enable?

Explain the ‘fallback’ key used in the `getStaticPaths` function.

What is the role of the `tsconfig.json` file in a Next.js project with TypeScript, and how do you customize it for your specific needs?