Next.js is an open-source JavaScript framework based on React for building server-side rendered (SSR) and statically generated (SSG) web applications. It provides many out-of-the-box features that enable developers to quickly build high-performance React applications.
The main features of Next.js include:
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Server-Side Rendering (SSR): Next.js supports server-side rendering, which means HTML is generated on the server and sent to the client, helping with SEO and first-screen load performance.
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Static Site Generation (SSG): Static HTML files can be generated at build time, perfect for pages with content that doesn't change frequently, such as blog posts, product pages, etc.
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Automatic Code Splitting: Next.js automatically splits code into small chunks, loading only the code needed for the current page, improving application performance.
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File System Routing: Automatically creates routes based on the file structure in the pages directory, no manual routing configuration required.
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API Routes: Can create API endpoints to handle server-side logic, such as database queries, authentication, etc.
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CSS Support: Built-in support for CSS Modules, Sass, styled-jsx, and other CSS solutions.
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TypeScript Support: Out-of-the-box TypeScript support, providing type safety.
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Image Optimization: Provides the next/image component to automatically optimize image size and format.
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Fast Refresh: Provides fast hot reload experience during development while maintaining component state.
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Environment Variables: Supports .env files to manage environment variables.
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Internationalization Support: Built-in i18n routing support for easily building multi-language applications.
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Incremental Static Regeneration (ISR): Allows updating static pages after build, combining the advantages of SSG and SSR.
Through these features, Next.js provides React developers with a powerful and easy-to-use framework, especially suitable for building web applications that require good SEO, high performance, and excellent user experience.