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Next.js

50 Next.js interview questions

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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?

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