Both JSS and styled-jsx are popular choices for styling in React applications. JSS has been around for longer and has a larger user base, while styled-jsx gained popularity due to its integration with Next.js. Both packages have a significant following in the React community.
JSS can be used with any React framework or library, including Next.js. It provides integrations with popular UI libraries like Material-UI and supports server-side rendering. styled-jsx, on the other hand, is tightly integrated with Next.js and provides a seamless styling experience for Next.js applications. It automatically handles server-side rendering and supports CSS encapsulation.
JSS generates unique class names for each component, which can result in larger CSS files. However, it provides optimizations like dynamic style injection and style caching to improve performance. styled-jsx uses a unique style scoping mechanism that generates unique class names for each component, ensuring that styles are scoped and isolated. This can lead to smaller CSS files and better performance.
Community and Maintenance
Both JSS and styled-jsx have active communities and are well-maintained. JSS is maintained by the team behind Material-UI and has a strong ecosystem of plugins and extensions. styled-jsx is maintained by the Next.js team and benefits from the popularity and support of the Next.js community.