Book Image

State Management with React Query

By : Daniel Afonso
Book Image

State Management with React Query

By: Daniel Afonso

Overview of this book

State management, a crucial aspect of the React ecosystem, has gained significant attention in recent times. While React offers various libraries and tools to handle state, each with different approaches and perspectives, one thing is clear: state management solutions for handling client state are not optimized for dealing with server state. React Query was created to address this issue of managing your server state, and this guide will equip you with the knowledge and skills needed to effectively use React Query for state management. Starting with a brief history of state management in the React ecosystem, you’ll find out what prompted the split from a global state to client and server state and thus understand the need for React Query. As you progress through the chapters, you'll see how React Query enables you to perform server state tasks such as fetching, caching, updating, and synchronizing your data with the server. But that’s not all; once you’ve mastered React Query, you’ll be able to apply this knowledge to handle server state with server-side rendering frameworks as well. You’ll also work with patterns to test your code by leveraging the testing library and Mock Service Worker. By the end of this book, you'll have gained a new perspective of state and be able to leverage React Query to overcome the obstacles associated with server state.
Table of Contents (14 chapters)
Part 1: Understanding State and Getting to Know React Query
Part 2: Managing Server State with React Query

Using the hydrate pattern

With the hydrate pattern, you can dehydrate your QueryClient with a previously prefetched query and send it to your client. On the client side, as soon as the page loads and JavaScript is available, React Query will hydrate your QueryClient with the existing data. After this process, React Query will also ensure your queries are up to date.

This is the process of how to leverage the best of your server-side framework and React Query with the hydrate pattern:

  1. The first thing you do is create a QueryClient instance.
  2. Using the previously created QueryClient instance, you leverage its prefetchQuery method to prefetch the data for that given query key.
  3. You dehydrate your QueryClient and send it to the client side.
  4. Your client receives the dehydrated state, hydrates it, and merges it with the QueryClient in use.
  5. Inside your component, you render your query using the useQuery hook with the same query key you added in step 2. Your query...