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    React Query

React Query

2 minutes of reading

Tomasz Kozon

React Query is a modern library for React that simplifies working with API-derived data. It allows quick and painless management of fetching, caching and updating data in the user interface.

Table of contents

What is React Query?

Why use React Query?

Core Concepts: Query, Mutation, Cache

React Query

As frontend applications - especially those built with React - become more complex, developers are finding themselves grappling with the challenges of fetching, storing, and syncing data from APIs. Traditional approaches, like using useState and useEffect to manage local component state, often fall short as an app grows. Dealing with loading states, error handling, data refetching, and caching can lead to repetitive and hard-to-maintain code. That’s where React Query steps in - a library crafted to simplify and automate these processes, letting developers concentrate more on building features rather than wrestling with data state.

 

What is React Query?

React Query is a robust library for data fetching and state management in React applications. Its primary aim is to make working with remote data easier - whether it’s from a REST API, GraphQL, or any other source. Instead of writing tedious boilerplate code to manage loading states, errors, retries, and caching manually, React Query offers a collection of hooks (like useQuery and useMutation) that take care of these tasks for you behind the scenes. This makes it a breeze to fetch and store data, keep it updated in the background, and automatically reflect those changes in the UI.

 

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Why use React Query?

React Query solves many of the common pain points developers encounter when dealing with server-side data in React apps. For starters, it automatically manages loading and error states, eliminating the need to write that logic from scratch in every component. It also provides built-in caching, so once data is fetched, it can be reused without making repeated API calls - boosting performance and reducing server load.

Another key benefit is automatic background updates. React Query can periodically poll the server for fresh data, ensuring your UI always reflects the most up-to-date information. It can also re-sync data when a user returns to the app after switching tabs or reconnects to the internet. With React Query, these features work out of the box, freeing developers from having to implement them manually.

React Query

Core Concepts: Query, Mutation, Cache

React Query is built around three core ideas that are essential to understand if you want to use the library effectively:

  • Query refers to any operation that fetches data - typically handled with the useQuery hook. This hook manages the full lifecycle of a request, including loading states, errors, successful responses, and caching. For example: useQuery(['users'], fetchUsers) is used to retrieve a list of users from an API.
  • Mutation involves any action that changes data, like submitting a form, editing a record, or deleting something. These are managed with the useMutation hook, which also supports features like showing success messages or triggering a refresh of related data once the operation completes.
  • Cache is React Query’s internal storage for fetched data. By storing responses locally, it allows for instant access to previously loaded data, reduces unnecessary network requests, and significantly improves the user experience - often enabling “instant loading” when revisiting content.

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