Unlock your full potential in mastering Next.js with Next.js Interview Guide: 100 Questions and Answers to Succeed ?. Whether you're just starting out as a developer or you're an experienced professional looking to take your skills to the next level, this comprehensive e-book is designed to help you ace Next.js interviews and become a confident, job-ready developer. The guide covers a wide range of Next.js topics, ensuring you're well-prepared for any question that might come your way.This e-book explores key concepts like Server-Side Rendering (SSR) ?, Static Site Generation (SSG) ?, Incremental Static Regeneration (ISR) ⏳, App Router ?️, Data Fetching ?, and much more. Each topic is explained thoroughly, offering real-world examples and detailed answers to the most commonly asked interview questions. In addition to answering questions, the guide highlights best practices ✅ for optimizing your Next.js applications, improving performance ⚡, and ensuring scalability ?. With Next.js continuously evolving, we also dive deep into cutting-edge features like React 18, Concurrent Rendering, and Suspense ?. This makes sure you're always up-to-date with the latest advancements, equipping you with the knowledge that interviewers are looking for.What sets this guide apart is its practical approach. It doesn’t just cover theory but provides actionable insights that you can apply directly to your projects. Security ?, SEO optimization ?, and deployment practices ?️ are also explored in detail to ensure you're prepared for the full development lifecycle.Whether you're preparing for a technical interview at a top tech company or seeking to build more efficient, scalable applications, this guide will help you sharpen your Next.js skills and stand out from the competition. By the end of this book, you’ll be ready to tackle any Next.js interview question with confidence, from fundamental concepts to expert-level challenges.Equip yourself with the knowledge to excel as a Next.js developer ? and confidently step into your next career opportunity!
Next.js allows you to control cache headers for static assets, dynamic routes, and API routes via next.config.js and custom headers in getServerSideProps or API routes.
Static assets: Next.js handles caching for static assets in the public/ folder automatically, but you can customize cache headers using headers() in next.config.js.
module.exports = {
async headers() {
return [
{
source: '/(.*)',
headers: [
{
key: 'Cache-Control',
value: 'public, max-age=31536000, immutable',
},
],
},
];
},
};
Dynamic pages: For dynamic pages generated at runtime, you can set cache headers in the getServerSideProps function.
export async function getServerSideProps() {
const res = await fetch('<https:>');
const data = await res.json();
return {
props: { data },
headers: {
'Cache-Control': 'public, max-age=60, stale-while-revalidate=30',
},
};
}
</https:>API routes: You can set cache headers in API routes to control how responses are cached.
export default function handler(req, res) {
res.setHeader('Cache-Control', 'public, max-age=3600, s-maxage=3600');
res.json({ data: 'example' });
}
Testing a Next.js application involves using tools like Jest, React Testing Library, and Cypress for end-to-end tests.
Unit tests: Use Jest and React Testing Library to test components and hooks.
npm install --save-dev jest @testing-library/react @testing-library/jest-dom
API route testing: For testing API routes, you can use supertest.
npm install --save-dev supertest
Example:
import request from 'supertest';
import app from './pages/api/hello';
describe('GET /api/hello', () => {
it('should return a 200 status code', async () => {
const response = await request(app).get('/api/hello');
expect(response.status).toBe(200);
});
});
End-to-end testing: Use Cypress for testing full user interactions.
npm install --save-dev cypress
Example:
describe('Home Page', () => {
it('should load correctly', () => {
cy.visit('/');
cy.contains('Welcome');
});
});
The App Router was introduced to enhance flexibility and simplify routing. With the App Router, Next.js allows for better structure and customization in large-scale applications. The App Router provides better support for advanced routing features like layouts, nested routing, and more.
The app/ directory is used with the App Router in Next.js 13 and later. It allows for more flexible routing, including support for layouts, nested routing, and parallel routes. The pages/ directory is used for the older Pages Router, where routes are defined directly by the file structure.
File-based routing in the App Router allows for:
In Next.js, Server Components and Client Components serve different purposes, and choosing between them depends on the use case:
In the App Router of Next.js, a component can be declared as a Client Component by using the 'use client' directive. This directive must be placed at the top of the file, before any imports or code, to indicate that the component should be treated as a Client Component.
Example:
module.exports = {
async headers() {
return [
{
source: '/(.*)',
headers: [
{
key: 'Cache-Control',
value: 'public, max-age=31536000, immutable',
},
],
},
];
},
};
Server Components offer several benefits related to performance and scalability:
The above is the detailed content of Next.js Interview Mastery: Essential Questions (Part 8). For more information, please follow other related articles on the PHP Chinese website!
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