What is Next.js?
Next.js is a React-based framework for building web applications and websites. It adds features that React lacks out-of-the-box: server-side rendering, static generation, optimized image handling, built-in routing and API routes. It is built by Vercel and is the dominant framework for production React apps in 2026.
Why is Next.js so popular?
Next.js solves a fundamental problem with regular React: React is a client-side framework, which means that the web host must download and run JavaScript before the user sees the content. It's bad for SEO and slow for first load.
Next.js solves this with Server Components and server-side rendering: HTML is generated on the server and sent to the browser fully rendered. It's faster, SEO friendly and provides better Core Web Vitals.
Next.js vs Vanilla React – when to choose which?
Plain React is right when you're building a Single Page Application where SEO doesn't matter - for example, an internal admin tool or a SaaS dashboard behind login.
Next.js is right when you build a website or application where SEO is important, the content must be visible without JavaScript, or where you want optimal first load time. It's also right when you want a built-in backend via API routes instead of a separate Express server.
The main features of Next.js 15
App Router is the modern routing architecture based on React Server Components. Server Components run on the server and send rendered HTML, dramatically reducing the JavaScript bundle size on the client. Turbopack is a new, extremely fast bundler that replaces Webpack and significantly accelerates the development experience.
When is Next.js surplus?
Next.js is powerful but also complex. For a simple marketing site without dynamic content, Webflow, Framer or a simple static framework may be a better choice. Next.js is right when you need combination of high performance, SEO, dynamic data and the React component model.
