NextJS Interview Questions and Answers – Part 2

In this article, we cover Top 100 NextJS Interview Questions and Answers with detailed code snippets.

Welcome back to our comprehensive guide on Next.js interview preparation!

In the first part of our series, we covered a wide range of foundational questions to help you build a strong base in Next.js.

This continuation aims to equip you with a thorough understanding and confidence to tackle even the most challenging interview questions.

Whether you’re an experienced developer or just starting, this guide will enhance your Next.js knowledge and readiness.

21. How can you configure custom webpack settings in Next.js?

You can customize the webpack configuration in Next.js by extending it in the next.config.js file.

22. What is the difference between Link from next/link and <a> tag in Next.js?

Link from next/link provides client-side navigation, prefetching, and seamless transitions, while the <a> tag performs a full page reload.

23. How do you use CSS-in-JS with Next.js?

You can use libraries like styled-components or emotion for CSS-in-JS in Next.js.

24. How do you handle static file serving in Next.js?

Static files in Next.js can be served from the public directory.

25. How can you implement Google Analytics in a Next.js application?

You can implement Google Analytics by including the tracking script in _app.js or _document.js.

26. How do you handle authentication in a Next.js application?

Authentication in Next.js can be handled using libraries like next-auth, Firebase, Auth0, or custom solutions.

27. What is the purpose of next.config.js in Next.js?

next.config.js is a configuration file for Next.js applications. It can be used to customize the build process, add environment variables, set up custom webpack configuration, redirects, rewrites, headers, and more.

28. How do you implement server-side redirects in Next.js?

You can implement server-side redirects using getServerSideProps.

29. How do you handle form submissions in Next.js?

Form submissions in Next.js can be handled by creating an API route to process the form data.

30. How can you implement static site generation with dynamic routes in Next.js?

You can use getStaticPaths with getStaticProps to implement static site generation with dynamic routes.

31. What are rewrites in Next.js and how do you configure them?

Rewrites allow you to map an incoming request path to a different destination path. They are configured in the next.config.js file.

32. How do you implement custom error pages in Next.js?

You can create custom error pages by adding _error.js for general errors and _404.js for 404 errors in the pages directory.

33. How do you add custom HTTP headers to your Next.js application?

You can add custom HTTP headers by using the headers function in the next.config.js file.

34. How do you manage state in a Next.js application?

You can manage state in a Next.js application using state management libraries like Redux, Zustand, or even React Context API.

35. What is the purpose of getInitialProps and why is it generally avoided in favor of getStaticProps and getServerSideProps?

getInitialProps is used to fetch data for a page before rendering. However, it can add complexity and performance overhead because it runs on both the server and client. getStaticProps and getServerSideProps provide more optimized and clear approaches for static generation and server-side rendering, respectively.t API.

36. How can you integrate a CMS with Next.js?

You can integrate a CMS like Contentful, Strapi, or Sanity with Next.js to fetch and display content.

37. How do you set up custom fonts in a Next.js application?

You can set up custom fonts by importing them in your _document.js file.

38. How do you handle image optimization in Next.js?

Next.js has a built-in Image component for automatic image optimization.

39. How do you deploy a Next.js application to Vercel?

You can deploy a Next.js application to Vercel by linking your GitHub repository to Vercel, configuring the project settings, and deploying directly from the Vercel dashboard.

Steps:

1. Sign in to Vercel and create a new project.
2. Import your Next.js repository from GitHub.
3. Configure the build and output settings (usually the defaults work fine).
4. Deploy the project.

40. What is the purpose of next/script and how do you use it?

next/script is used to add third-party scripts to a Next.js application, offering optimizations like loading strategies and support for onLoad events.

With the completion of “NextJS Top 100 Interview Questions and Answers – Part 2,” you now have a robust arsenal of knowledge to tackle any Next.js interview.

These advanced questions and answers are designed to challenge your understanding and ensure you’re well-prepared for any scenario.

As you continue to practice and refine your skills, remember that mastery comes with consistent effort and dedication.

We hope this guide has been instrumental in your preparation journey, and we wish you the best of luck in your Next.js interviews.

Keep pushing forward, and success will surely follow.