Next.js vs React: What's the Difference and Which Do You Need?

“Should we use Next.js or React?” is one of the most common questions in web projects, and it’s slightly the wrong question. It’s a bit like asking “should we use an engine or a car?” Next.js is built on top of React. Every Next.js app is a React app, with a lot of extra machinery around it.

The real question is: do you need a framework around React, and if so, is Next.js the right one? This guide explains the difference between a library and a framework, when server rendering actually matters, and how to choose for your project.

The short version

• React is a JavaScript library for building user interfaces out of reusable components. It handles what shows on screen and how it updates when data changes. It doesn’t prescribe how you handle routing, data fetching, server rendering or builds.
• Next.js is a React framework for building full-stack web applications. Its documentation says you use React components to build the interface, and Next.js for additional features and optimizations, including automatic configuration of bundlers and compilers.

So when someone says “we built it in React,” they might mean React plus a handful of separate tools they chose and wired together. When someone says “we built it in Next.js,” they mean React plus a framework that made most of those choices for them.

Library vs framework: why it matters

A library is code you call when you need it. You stay in charge of the overall structure. React gives you components, state and hooks, and leaves everything else to you.

A framework calls your code. It sets the structure: where files go, how pages map to URLs, how data loads and how the app is built and deployed. You fill in the pieces.

Using React on its own means making decisions about:

• Routing: how URLs map to screens
• Data fetching: how and where you load data
• Rendering: in the browser only, or on the server too
• Build tooling: bundling, code splitting, image handling
• Backend logic: where API endpoints and server code live

React’s own documentation now recommends starting new apps with a framework such as Next.js or React Router, and notes that building from scratch gives more flexibility but requires choosing tools for routing, data fetching and other common patterns. In February 2025, the React team also deprecated Create React App, the old default starter, for new apps.

Side-by-side comparison

When server rendering matters

The biggest practical difference is where your pages get built.

In a classic React single-page app, the server sends a mostly empty HTML file and a JavaScript bundle. The browser downloads and runs the JavaScript, then draws the page. That’s client-side rendering.

Next.js can instead build the HTML on the server, either on each request (server-side rendering) or ahead of time at build (static generation), and send a finished page. React then “hydrates” it so it becomes interactive.

Server rendering matters most when:

• Search traffic is important. Google processes JavaScript pages in stages: crawling, rendering and indexing. Its documentation calls server-side rendering or pre-rendering “still a great idea” because it helps users and crawlers, and because not all bots can run JavaScript.
• First load speed matters. Users see content sooner on slow phones and networks when HTML arrives ready.
• Pages are shared on social media. Link previews depend on metadata in the HTML.
• Content changes often but is the same for many visitors, such as product pages, articles or listings.

Server rendering matters less when:

• Everything is behind a login. Dashboards, admin panels and internal tools aren’t indexed anyway.
• The app is highly interactive after load, like an editor, a design tool or a real-time trading screen.
• You already have a separate backend and just need a front end that talks to its API.

Key takeaway: If people need to find your pages on Google or load them fast on a phone, server rendering is worth having, and Next.js makes it the default. If your app lives behind a login, plain React is often simpler.

Server Components and the App Router

Next.js has 2 routing systems. The App Router is the newer one and supports React Server Components. The Pages Router is the original and is still supported.

React Server Components let parts of the page run only on the server. They can read from a database or call a private API directly, and send the result as HTML without shipping that code to the browser. That can mean smaller JavaScript bundles and simpler data loading. It also adds new concepts, such as deciding which components run on the server and which on the client, that teams need time to learn.

Hosting and cost considerations

A client-only React app compiles to static files you can host almost anywhere, often cheaply, including behind a CDN.

The Next.js docs list 4 deployment options: a Node.js server and a Docker container both support all features; a static export supports only features that don’t need a server; and platform adapters vary by provider. Many teams use managed platforms, while others self-host on their own cloud. Server rendering means running compute for requests, which affects your hosting bill and operations. If you’re going the managed route, our explainer on serverless computing covers how that pricing model works.

Which should you choose?

If you’re still choosing between React and other front-end options, see React vs Angular vs Vue. And if you’re not sure whether you’re building a site or an application, start with web app vs website.

Where to start

1. Decide what needs to be public. List pages that must rank on Google or load fast for new visitors.
2. Check your backend. If you have none, Next.js lets you add server code in the same project. If you have one, either choice can call its API. Our guide to frontend vs backend development explains the split.
3. Match your team’s skills. Developers new to React should learn components, state and hooks before Next.js concepts like server components and caching.
4. Pick a hosting plan that supports the features you need.
5. Use TypeScript from day one for anything beyond a prototype. See TypeScript vs JavaScript.
6. Prototype one real page in your chosen setup and measure load speed before committing.
7. Run a technical SEO checklist before launch for any public pages.

Conclusion

React is the library that builds your interface. Next.js is a framework that wraps React with routing, server rendering, data fetching and build tooling. For public sites where SEO and speed matter, Next.js is usually the stronger starting point, and React’s own docs recommend starting with a framework. For apps that live entirely behind a login, plain React with a simple build tool can be lighter and easier. Choose based on where your pages need to be rendered and who will maintain the code.

Sources

• Next.js Docs: What is Next.js? — framework definition, App Router and Pages Router
• Next.js Docs: Deploying — Node.js server, Docker, static export and adapter options
• React: Creating a React App — recommendation to start with a framework, and trade-offs of building from scratch
• React Blog: Sunsetting Create React App — deprecation of Create React App in February 2025
• Google Search Central: JavaScript SEO basics — how Google renders JavaScript and its server-rendering guidance