1) What is Next.js?
Answer: A React framework for building server-rendered and statically generated web applications.
2) How do you create a new Next.js project?
Answer: Using npx create-next-app command.
3) What is the purpose of the pages directory in Next.js?
Answer: It contains React components that are automatically routed based on their file name.
4) What is file-based routing in Next.js?
Answer: Routing based on the file structure in the pages directory.
5) How do you create a dynamic route in Next.js?
Answer: By using square brackets in the filename, e.g., [id].js.
6) What is getStaticProps?
Answer: A function used for static site generation to fetch data at build time.
7) What is getServerSideProps?
Answer: A function used for server-side rendering to fetch data on each request.
8) What is getStaticPaths?
Answer: A function used with getStaticProps to specify dynamic routes to be pre-rendered.
9) What is the difference between getStaticProps and getServerSideProps?
Answer: getStaticProps fetches data at build time, while getServerSideProps fetches data on each request.
10) What is the Link component in Next.js?
Answer: A component for client-side navigation between pages.
11) What is the useRouter hook in Next.js?
Answer: A hook that allows access to the router object and perform navigation.
12) How do you navigate programmatically in Next.js?
Answer: Using useRouter().push('/path').
13) What is the _app.js file in Next.js?
Answer: A custom App component that initializes pages and can add global styles or layout components.
14) What is the _document.js file in Next.js?
Answer: A custom Document component that allows customization of the HTML document structure.
15) How do you add global CSS in Next.js?
Answer: By importing the CSS file in _app.js.
16) How do you add component-level CSS in Next.js?
Answer: Using CSS modules with a .module.css file extension.
17) What is static site generation (SSG) in Next.js?
Answer: Pre-rendering pages at build time.
18) What is server-side rendering (SSR) in Next.js?
Answer: Rendering pages on each request.
19) What is incremental static regeneration (ISR) in Next.js?
Answer: Re-generating static pages at runtime as traffic comes in.
20) What is the Image component in Next.js?
Answer: A component that optimizes images for faster loading.
21) What is next.config.js?
Answer: A configuration file to customize Next.js settings.
22) How do you enable TypeScript in a Next.js project?
Answer: By adding a tsconfig.json file.
23) What is API Routes in Next.js?
Answer: A feature to create API endpoints in the pages/api directory.
24) How do you deploy a Next.js app to Vercel?
Answer: By connecting the repository to Vercel and deploying it.
25) What is pre-rendering in Next.js?
Answer: Generating HTML for pages in advance, instead of on each request.
26) What is the difference between static generation and server-side rendering?
Answer: Static generation pre-renders at build time, SSR pre-renders on each request.
27) How do you handle redirects in Next.js?
Answer: By configuring redirects in next.config.js.
28) What is the Head component in Next.js?
Answer: A component for modifying the
of a page.29) How do you fetch data in a Next.js page?
Answer: Using getStaticProps or getServerSideProps.
30) What is dynamic import in Next.js?
Answer: A feature to load components or modules dynamically.
31) How do you handle environment variables in Next.js?
Answer: By adding them to .env.local and accessing via process.env.
32) What is fallback in getStaticPaths?
Answer: Determines how to handle missing paths, with true, false, or 'blocking'.
33) What is a custom server in Next.js?
Answer: A way to customize the server-side behavior, e.g., with Express.
34) What is the next/head package used for?
Answer: To manage the document head for meta tags, title, etc.
35) How do you create a 404 page in Next.js?
Answer: By adding a 404.js file in the pages directory.
36) What is the use of next export command?
Answer: To export a static version of the Next.js app.
37) How do you optimize fonts in Next.js?
Answer: By using the built-in font optimization feature.
38) What is the default port for a Next.js app?
Answer: Port 3000.
39) How do you add custom headers in Next.js?
Answer: By configuring headers in next.config.js.
40) What is Fast Refresh in Next.js?
Answer: A feature for quick feedback when editing React components.
41) What is the public folder in Next.js?
Answer: A folder for static assets served from the root URL.
42) How do you configure a custom Babel setup in Next.js?
Answer: By adding a babel.config.js file.
43) How do you handle internationalization (i18n) in Next.js?
Answer: By configuring i18n settings in next.config.js.
44) What is React Strict Mode in Next.js?
Answer: A development mode that highlights potential problems in an application.
45) What is a singleton router in Next.js?
Answer: A single router instance accessible across the application.
46) What is the useTranslation hook in Next.js?
Answer: A hook for handling translations when using i18n.
47) How do you create custom error pages in Next.js?
Answer: By adding _error.js in the pages directory.
48) What is AMP in Next.js?
Answer: Accelerated Mobile Pages, a framework for fast-loading mobile pages.
49) How do you enable AMP in Next.js?
Answer: By adding amp attribute to a page component.
50) What is the next/image component used for?
Answer: To optimize and serve images in a Next.js application.
51) What is the next/link component used for?
Answer: For client-side navigation between pages.
52) What is the difference between pages and components directories?
Answer: pages contains routable components, components contains reusable UI components.
53) How do you handle middleware in Next.js?
Answer: Using middleware functions in next.config.js.
54) How do you add polyfills in Next.js?
Answer: By customizing the webpack configuration in next.config.js.
55) What is the difference between client-side and server-side rendering in Next.js?
Answer: Client-side rendering happens in the browser, server-side rendering happens on the server.
56) What is static optimization in Next.js?
Answer: Automatically determining if a page can be statically generated.
57) How do you fetch data on the client-side in Next.js?
Answer: Using useEffect and fetch or other data fetching libraries.
58) How do you implement authentication in Next.js?
Answer: Using libraries like NextAuth.js or custom authentication logic.
59) What is the difference between _app.js and _document.js?
Answer: _app.js is for global components, _document.js is for modifying the HTML document structure.
60) How do you create API endpoints in Next.js?
Answer: By adding files to the pages/api directory.
61) What is ISR in Next.js?
Answer: Incremental Static Regeneration, updating static pages after build without redeploying.
62) How do you configure Webpack in Next.js?
Answer: By extending the Webpack configuration in next.config.js.
63) What is the purpose of next-env.d.ts?
Answer: It provides type definitions for TypeScript support in Next.js.
64) How do you handle routing in a Next.js app?
Answer: Using the file-based routing system in the pages directory.
65) What is the purpose of next/dynamic?
Answer: To enable dynamic imports and code splitting.
66) How do you add meta tags in Next.js?
Answer: Using the Head component from next/head.
67) What is the purpose of next-compose-plugins?
Answer: To compose multiple plugins in next.config.js.
68) How do you handle form submissions in Next.js?
Answer: Using client-side form handling or API routes for server-side handling.
69) How do you set up Redux in a Next.js project?
Answer: By creating a Redux store and integrating it with _app.js.
70) What is the purpose of next/router?
Answer: To handle routing and navigation within a Next.js app.
71) How do you use CSS-in-JS with Next.js?
Answer: Using libraries like styled-components or Emotion.
72) How do you handle redirects in Next.js?
Answer: By adding a redirects property in next.config.js.
73) How do you use Sass in a Next.js project?
Answer: By installing sass and importing .scss files in your components.
74) What is the basePath option in Next.js?
Answer: It allows you to specify a base path for the application.
75) How do you customize the 500 error page in Next.js?
Answer: By creating a 500.js file in the pages directory.
76) What is the trailingSlash option in Next.js?
Answer: It configures whether to include a trailing slash in the URLs.
77) What is the difference between push and replace in useRouter?
Answer: push adds a new entry in the history stack, replace replaces the current entry.
78) What is ssr: false in dynamic import?
Answer: It disables server-side rendering for the dynamically imported component.
79) How do you configure PWA in Next.js?
Answer: By using plugins like next-pwa and configuring next.config.js.
80) How do you add Google Analytics to a Next.js project?
Answer: By including the Google Analytics script in _app.js or _document.js.
81) What is the purpose of middleware in Next.js?
Answer: To run code before a request is completed.
82) How do you use Apollo Client with Next.js?
Answer: By setting up Apollo Provider in _app.js and creating a client.
83) What is the publicRuntimeConfig in Next.js?
Answer: Configuration exposed to the browser.
84) What is the serverRuntimeConfig in Next.js?
Answer: Configuration only available on the server side.
85) What is the purpose of _error.js in Next.js?
Answer: To customize the error page for HTTP errors.
86) How do you perform client-side data fetching in Next.js?
Answer: Using useEffect and fetch or any other data-fetching library.
87) What is the use of next-seo in Next.js?
Answer: To manage SEO metadata in a Next.js application.
88) How do you use Tailwind CSS in Next.js?
Answer: By installing tailwindcss and configuring it with PostCSS.
89) How do you configure next-i18next in Next.js?
Answer: By installing next-i18next and setting up the configuration in next.config.js.
90) What is next/script used for?
Answer: To optimize loading third-party scripts.
91) How do you enable custom fonts in Next.js?
Answer: By using the next/font package or including fonts in the public directory.
92) How do you set up GraphQL in Next.js?
Answer: By using Apollo Client or another GraphQL client.
93) What is swcMinify in next.config.js?
Answer: It enables the use of the SWC compiler for minification.
94) What is the use of next-compose-plugins?
Answer: To enable composition of multiple plugins in Next.js configuration.
95) What is a hybrid application in Next.js?
Answer: An application that uses both static generation and server-side rendering.
96) How do you handle CORS in Next.js API routes?
Answer: By setting headers in the API route handlers.
97) What is the purpose of rewrites in next.config.js?
Answer: To map an incoming request path to a different destination path.
98) How do you manage cookies in Next.js?
Answer: Using libraries like cookie or js-cookie to set and retrieve cookies.
99) How do you handle authentication tokens in Next.js?
Answer: By storing tokens in cookies or local storage and sending them with requests.
100) What is next-pwa used for?
Answer: To configure and enable Progressive Web App features in Next.js.
101) What is the next-sitemap package used for?
Answer: To generate sitemaps for a Next.js application.