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next.js·Beginner·Last tested: 2026-03·~5 min read

Next.js

Next.js is a React framework that enables full-stack web application development with built-in optimizations and server-side capabilities. It extends React with powerful features like server-side rendering, static site generation, and automatic code splitting.

Key Features

  • Server-side rendering (SSR) and static site generation (SSG) out of the box
  • File-based routing with automatic route creation
  • API routes for building backend endpoints within your React app
  • Automatic code splitting and performance optimizations
  • Built-in CSS and Sass support with CSS-in-JS compatibility
  • Image optimization and font optimization automatically applied
  • TypeScript support with zero configuration
  • Fast refresh for instant feedback during development

Installation

Create a new Next.js project:

npx create-next-app@latest my-app
cd my-app
npm run dev

Or add to existing project:

npm install next react react-dom

Basic Usage

Create a simple page in pages/index.js:

export default function Home() {
  return (
    <div>
      <h1>Welcome to Next.js</h1>
      <p>This page is server-side rendered by default</p>
    </div>
  )
}

// Optional: fetch data at build time
export async function getStaticProps() {
  return {
    props: {
      message: "Hello from the server!"
    }
  }
}
Tip

Next.js automatically creates routes based on your file structure in the pages directory. No router configuration needed.

Notable Details

  • License: MIT
  • Language: JavaScript with TypeScript support
  • Community: 138k+ GitHub stars, active Discord and GitHub Discussions
  • Maintenance: Actively developed by Vercel with frequent releases
  • Production ready: Used by major companies worldwide