If you're reading this, this means you've reached the final part of this book, which uses React to build web applications. In the preceding chapters, you've already used the core features of React, such as rendering components, state management with Context, and Hooks. You've learned how to create a PWA and an SSR application and how to add routing to your React application. Also, you know how to add testing to a React application with Jest and Enzyme. Let's add GraphQL to the list of things you've learned about so far.

In this chapter, you will not only build the frontend of an application, but also the backend. For this, GraphQL will be used, which can best be defined as a query language for APIs. Using mock data and Apollo Server, you'll extend a GraphQL server that exposes...