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


In this chapter, we learned about the useQuery custom hook and how it allows you to fetch and cache your data by using its required options, called query key and query function. You learned how to define your query key and how your query function allows you to use any data-fetching client such as GraphQL or REST, so long it returns a promise or throws an error.

You also learned about some of the things that the useQuery hook returns, such as the query’s data and error. For you to craft a better user experience, you were also introduced to status and fetchStatus.

For you to customize your developer experience and take it to the next level, you learned about some commonly used options you can use to customize your useQuery hook and make it behave as you want it to. For your convenience, here are the compiled defaults to be aware of:

  • staleTime: 0
  • cacheTime: 5 * 60 * 1,000 (5 minutes)
  • retry: 3
  • retryDelay: Exponential backoff delay algorithm
  • ...