React vs. Next.js

React and Next.js are both popular tools in the JavaScript ecosystem and Typescript, but they serve different purposes and have different strengths.
React and Next.js are two technologies widely used in web development, both centered on the JavaScript universe. Developed by Facebook, React consists of a collection of components, which are snippets of reusable JavaScript code, worked on to build the user interface (UI), Next.js is a framework built on top of React, providing a more robust development experience. structured and optimized. In this article, we'll explore the differences between React and Next.js, highlighting their strengths and use cases.

React

React is a JavaScript library for building user interfaces. It's maintained by Facebook and is often used to build single-page applications (SPAs). Here are some key points:

• Component-Based: React’s core concept is the component. You build encapsulated components that manage their own state and then compose them to make complex UIs.
• Client-Side Rendering: By default, React apps are rendered on the client side, meaning the browser downloads the JavaScript, which then renders the UI.
• Flexibility: React is flexible and doesn’t impose a specific structure or pattern. This can be both a benefit and a challenge, as you have to make more decisions about how to set up and manage your application.
• Ecosystem: React has a vast ecosystem of libraries and tools for state management (e.g., Redux, MobX), routing (e.g., React Router), and more.

Next.js

Next.js is a framework built on top of React, created by Vercel. It adds additional features and capabilities to React applications. Here are some of its key features:

• Server-Side Rendering (SSR): Next.js allows you to pre-render pages on the server, which can improve performance and SEO compared to client-side rendering alone.
• Static Site Generation (SSG): With Next.js, you can also generate static pages at build time. This is useful for sites that don’t need to be dynamic and can benefit from fast load times.
• API Routes: Next.js includes a built-in API routing system that allows you to create serverless functions easily.
• File-Based Routing: Routing in Next.js is based on the file system. Pages are created by adding files to the pages directory, which simplifies routing and reduces boilerplate code.
• Automatic Code Splitting: Next.js automatically splits code for each page, so users only download the JavaScript needed for the current page.

Summary

• React: Ideal if you want a flexible library to build SPAs and are comfortable setting up your own SSR or SSG solutions, and managing your own routing and state management.
• Next.js: Best if you need built-in support for SSR, SSG, and routing out of the box. It’s a good choice if you want to leverage server-side capabilities and build more complex applications quickly.

In essence, Next.js builds on top of React and provides a more structured environment with additional features that can be especially beneficial for certain types of projects. If you’re starting a new project and want a robust, full-featured framework with minimal setup, Next.js might be the way to go. If you prefer more control and flexibility, or you’re building a simpler SPA, React alone might be sufficient.

Source: https://www.dio.me/articles/react-vs-nextjs