Of course! I will translate the comparison between React and Next.js into Portuguese:

React

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

• Component-Based: The core concept of React is the component. You build encapsulated components that manage their own state and then compose them to create complex UIs.
• Client-Side Rendering: By default, React applications are rendered client-side, which means the browser downloads JavaScript, which then renders the user interface.
• Flexibility: React is flexible and does not impose a specific structure or pattern. This can be both an advantage and a challenge as you need to make more decisions about how to configure 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 React, created by Vercel. It adds additional functionality and capabilities to React applications. Here are some key resources:

• Server-Side Rendering (SSR): Next.js allows you to pre-render pages on the server, which can improve performance and SEO compared to just client-side rendering.
• 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 loading times.
• API Routes: Next.js includes a built-in API routing system that allows you to easily create serverless functions.
• 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 the code for each page, so users download only the JavaScript needed for the current page.

Summary

• React: Ideal if you want a flexible library for building SPAs and are comfortable configuring your own SSR or SSG solutions as well as 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 take advantage of server-side capabilities and build more complex applications quickly.

In essence, Next.js builds on React and offers a more structured environment with additional features that can be especially beneficial for certain types of projects. If you are starting a new project and want a robust and complete framework with minimal configuration, Next.js could be the best choice. If you prefer more control and flexibility, or are building a simpler SPA, React alone may be sufficient.

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