React Router keeps your UI in sync with the URL. It has a simple API with powerful features like lazy code loading, dynamic route matching, and location transition handling built right in. Make the URL your first thought, not an after-thought.
Installation
You can install React Router from the public npm registry with either npm or yarn.
npm install react-router-dom
CSS-in-JS refers to a pattern where CSS is composed using JavaScript instead of defined in external files.
Note that this functionality is not a part of React, but provided by third-party libraries. React does not have an opinion about how styles are defined; if in doubt, a good starting point is to define your styles in a separate *.css file as usual and refer to them using className.
To build a complete web application with React from scratch, there are many important details you need to consider:
Code has to be bundled using a bundler like webpack and transformed using a compiler like Babel. You need to do production optimizations such as code splitting. You might want to statically pre-render some pages for performance and SEO. You might also want to use server-side rendering or client-side rendering. You might have to write some server-side code to connect your React app to your data store. A framework can solve these problems. But such a framework must have the right level of abstraction — otherwise it won’t be very useful. It also needs to have great “Developer Experience”.
Next.js has the best-in-class “Developer Experience” and many built-in features; a sample of them are:
Next.js is used in tens of thousands of production-facing websites and web applications, including many of the world’s largest brands.