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If you’re preparing for a frontend or full-stack role, these Next.js interview questions asked in 2025 will help you understand what top companies actually expect.
If you are preparing for a frontend, React, or full-stack developer interview, these Next.js interview questions asked in 2025 will help you confidently explain both fundamentals and advanced concepts. This guide covers beginner to advanced questions, practical examples, and real interview expectations.For official documentation and updates, you can always refer to the Next.js official documentation.
If you are preparing for frontend roles, this guide will also help you understand common React and frontend interview expectations.
Contents
Before diving into interview questions, it’s important to understand why interviewers care so much about Next.js.
In 2025, companies expect developers to build applications that are:
Next.js solves these problems by combining React with powerful features like Server-Side Rendering (SSR), Static Site Generation (SSG), Incremental Static Regeneration (ISR), and API Routes.
As a result, Next.js interview questions are now common in:
Answer:
Next.js is an open-source React framework developed by Vercel that enables developers to build fast, scalable, and SEO-friendly web applications. It extends React by adding features such as server-side rendering, static site generation, file-based routing, API routes, and built-in performance optimizations.
Unlike traditional React applications, Next.js allows pages to be rendered on the server or at build time, improving performance and search engine visibility.
Interviewers often ask about features, not just definitions.
Understanding when and why to use each feature is critical for interviews.
Answer:
Next.js provides several benefits that make it suitable for modern web development:
Because of these advantages, Next.js is widely used in production-grade applications.
Answer:
Server-Side Rendering in Next.js means that the page is rendered on the server for every request. When a user visits a page, the server generates the HTML dynamically and sends it to the browser.
SSR is implemented using the getServerSideProps function, which runs on the server for each request. This approach ensures fresh data and improves SEO, especially for dynamic content.
Answer:
Static Site Generation generates HTML pages at build time instead of request time. These pages are then served as static files, resulting in extremely fast performance.
SSG is implemented using getStaticProps. It is ideal for blogs, documentation sites, landing pages, and content that does not change frequently.
Answer:
Incremental Static Regeneration allows you to update static pages after deployment without rebuilding the entire site. With ISR, Next.js regenerates pages in the background based on a revalidation time.
This feature combines the speed of static pages with the flexibility of dynamic updates, making it a popular interview topic in 2025.
Answer:
| Feature | SSR | SSG | ISR |
|---|---|---|---|
| Render time | On every request | At build time | At runtime (periodic) |
| Performance | Medium | Very fast | Fast |
| SEO | Excellent | Excellent | Excellent |
| Use case | Dynamic data | Static content | Semi-dynamic content |
Interviewers often expect you to explain use cases, not just definitions.
Answer:
Next.js uses a file-based routing system. Each file inside the pages directory automatically becomes a route. For example:
pages/index.js → /pages/about.js → /aboutThis approach eliminates the need for external routing libraries like React Router.
Answer:
Dynamic routes are created using square brackets in file names.
Example:
pages/posts/[slug].js
The slug parameter can be accessed using useRouter or data-fetching methods like getStaticPaths.
Dynamic routing is commonly used for blogs, product pages, and user profiles.
Answer:getStaticProps fetches data at build time and passes it as props to the page component. It is used for static site generation and improves performance.
Answer:getServerSideProps fetches data on every request. It is used when data must always be up-to-date, such as dashboards or authenticated pages.
Answer:getStaticPaths is used with dynamic routes to specify which paths should be pre-rendered at build time. It is essential when using SSG with dynamic routes.
Answer:
API routes allow you to create backend endpoints inside a Next.js application. Files inside pages/api act as serverless functions.
They are commonly used for:
This feature enables full-stack development using Next.js alone.
Answer:
API routes are serverless and run on-demand. They do not require managing a separate server and scale automatically, making them ideal for modern cloud-based applications.
Answer:
Next.js supports multiple styling options:
CSS Modules are preferred because they prevent style conflicts by scoping styles locally.
Answer:
Performance can be improved by:
next/imagePerformance optimization is a high-priority interview topic in 2025.
Answer:_app.js is used to initialize pages. It allows you to:
Answer:_document.js customizes the HTML document structure. It is mainly used for server-side rendering customization and adding meta tags.
Answer:
Middleware allows you to run code before a request is completed. It is commonly used for authentication, redirects, and request validation.
Answer:
Edge functions run closer to users geographically, reducing latency. They are ideal for authentication, personalization, and A/B testing.
Answer:
Authentication can be handled using:
NextAuth.js is the most popular choice in 2025.
Interviewers look for decision-making skills, not just syntax.
getStaticProps fails during build?fetch() in App Router vs Pages Router?next/image improve LCP?next/dynamic[slug].jsgetStaticProps_app.jsnext/image👉 Interviewers check architecture thinking, not just syntax.
📌 Tip for interviews:
একটা solid Next.js project > 10 tutorials
Mastering these Next.js interview questions asked in 2025 will give you a strong advantage in frontend and full-stack interviews. Employers are not only looking for developers who can write code but also for those who understand architecture, performance, and scalability.
If you can confidently explain when to use SSR, SSG, or ISR—and back it up with real-world examples—you will stand out from other candidates.
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