Questions
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1What is Next.js?
2What are the advantages of Next.js?
3How do you create a new Next.js project?
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02 / 03

What are the advantages of Next.js?

Next.js builds upon the foundation of React but adds several features and optimizations that make it particularly well-suited for building modern web applications.

  1. 1

    Server-side Rendering (SSR) and Static Site Generation (SSG): Next.js applications can pre-render pages on the server, improving initial loading times and SEO. Traditional React applications typically render content on the client side, which can lead to slower initial page loads and less favorable SEO performance.

  2. 2

    Dynamic HTML Streaming: Instead of waiting for the whole page to be ready, the server sends the HTML in chunks as soon as they are generated.

  3. 3

    Server Components : Next.js supports Server Components (RSC). In the App Router, every component you create is a Server Component by default.

  4. 4

    Routing: Next.js provides automatic zero setup client-side routing out of the box, making it easier to manage navigation within your application. In traditional React applications, you would often need to rely on third-party libraries or build your own routing solution.

  5. 5

    Code Splitting: Next.js automatically performs code splitting, which means that it divides your JavaScript code into smaller chunks that are loaded only when needed. This can improve performance by reducing the initial bundle size and allowing users to download only the code required for the current page.

  6. 6

    Built-in Optimization: Automatic image, font and script optimization. The next/image component automatically optimizes images for faster loading and better performance.

  7. 7

    Full stack: Easily create API endpoints within your Next.js project, eliminating the need for a separate backend.

  8. 8

    Hybrid Rendering: Choose between SSR, SSG, or client-side rendering (CSR) on a per-page basis, allowing for flexible and scalable architectures.

  9. 9

    Vercel Integration: Seamless deployment with Vercel, the platform created by the makers of Next.js, offering features like automatic CI/CD, preview deployments, and more.

Difficulty: 6/10
Topics: rendering-strategies, performance-optimization, routing-architectures

Scenario Questions

0-2 years experience
  1. 1

    Imagine we are building a simple blog where the content changes maybe once a week. How would you set up Next.js to ensure the pages load almost instantly for users while still keeping the content updated without redeploying the whole site?

  2. 2

    We have a React app where users complain about a blank screen for 2 seconds while the JS bundle loads. If we migrate this to Next.js, how does its default rendering behavior help solve this, and what does the user see instead?

  3. 3

    You need to add a new 'About Us' page and a dynamic product detail page like '/products/:id' in a Next.js project. How would you structure your files to set up these routes, and how does Next.js handle this differently than React Router?

2-5 years experience
  1. 1

    We migrated a dashboard page to Next.js SSR to improve initial load time, but now our Time to First Byte (TTFB) has spiked because the database query in our server-side code is slow. How would you debug this, and what strategies would you use to bring TTFB down without losing the SEO or pre-rendering benefits?

  2. 2

    Our marketing team wants a highly dynamic landing page with personalized banners based on the user's location, but they also demand sub-second load times and perfect SEO. If we use Next.js, how would you balance static generation with this personalization requirement? What are the trade-offs of using Middleware here?

5-8 years experience
  1. 1

    We are running a large e-commerce site with over 100,000 product pages on Next.js. Building all of them statically at build time takes over an hour, but rendering them purely on-demand via SSR overloads our database during peak traffic. How would you architect a hybrid rendering and caching strategy using Next.js to solve both build times and database load?

  2. 2

    With the shift to Next.js App Router and React Server Components (RSCs), we want to refactor a complex product page that has interactive reviews, a dynamic cart, and static product details. How would you draw the boundary between Server and Client components to optimize the bundle size sent to the browser while maintaining a highly interactive UX?

8+ years experience
  1. 1

    Our company has a massive legacy single-page React app (CSR) managed by multiple product teams. We want to migrate to Next.js to improve Core Web Vitals, but we cannot do a big-bang rewrite. How would you design an incremental migration strategy that allows teams to ship Next.js pages alongside the legacy app without breaking the global state or user session?

  2. 2

    We are evaluating whether to adopt Next.js for our entire enterprise suite of internal and external web apps. Some teams are pushing for Next.js, while others prefer a decoupled Vite + Express setup. What architectural, operational, and hosting trade-offs (e.g., Vercel lock-in vs. self-hosting on AWS/Docker) would you present to the leadership team to make this decision?

Follow-up Questions

  • ❓How does the introduction of React Server Components (RSC) in the App Router change your data fetching strategy compared to the Pages Router?
  • ❓If a page has highly dynamic, user-specific data, would you still use SSR, or would you opt for client-side fetching? Why?
  • ❓What are the operational trade-offs of self-hosting a Next.js application on Node/Docker versus deploying it on a serverless platform like Vercel?