What are the main differences between using Create React App and Next.js

Server-side Rendering (SSR) vs Client-side Rendering (CSR)

- Next.js provides built-in support for server-side rendering, which can improve initial page load times and SEO[1][2][3][4]. CRA is primarily focused on client-side rendering for single-page applications[1][3].

Automatic Code Splitting

- Next.js automatically code splits based on the page, which can lead to faster load times[4][5]. CRA requires manual configuration for code splitting[5].

File-based Routing

- Next.js uses file-based routing, where the file structure maps directly to the application routes[3]. CRA requires setting up routing manually with a library like React Router.

Static Site Generation (SSG)

- Next.js supports static site generation, where pages can be pre-rendered at build time[2][3]. CRA does not have built-in SSG capabilities.

Configurability

- Next.js has a more opinionated structure but provides more built-in features and optimizations out of the box[1][3]. CRA allows more flexibility to customize the build setup using tools like Webpack[1][2].

Learning Curve

- Next.js has a steeper learning curve, especially for beginners, due to its additional concepts like SSR and file-based routing[3]. CRA has a simpler setup and is easier to get started with[1][2].

In summary, Next.js is better suited for applications that require server-side rendering, static site generation, and automatic code splitting, while CRA is a good choice for simpler client-side rendered single-page applications that don't require as much configuration.