What is React Query?
Published: 2024-02-12 05:11:03


**What is React Query?**


React Query is a powerful JavaScript library designed for managing asynchronous data fetching, caching, and state synchronization in React applications. It provides developers with a simple and intuitive API to streamline data fetching operations from various sources, including RESTful APIs, GraphQL endpoints, and local state. With features like built-in caching, automatic refetching, error handling, and integration with React components, React Query simplifies the process of handling asynchronous operations and enhances the performance and maintainability of React applications.


**Why do developers use React Query?**


Developers use React Query for several reasons:

1. Simplified Data Fetching: React Query abstracts away the complexities of data fetching, providing a straightforward API to fetch data from different sources.
2. Caching and Data Management: It offers built-in caching capabilities with intelligent cache invalidation strategies, optimizing performance by minimizing unnecessary network requests.
3. Automatic Refetching and Background Updates: React Query automatically refetches data when it becomes stale and supports background updates to keep the UI responsive.
4. Error Handling and Retry Logic: It provides configurable error handling and retry logic, enabling developers to handle network errors gracefully.
5. Integration with React Ecosystem: React Query seamlessly integrates with React components and hooks, making it easy to incorporate data fetching logic into React applications.
6. DevTools Support: It comes with a set of developer tools, including a DevTools extension for debugging and inspecting queries, mutations, and cache state in real-time.


React Query provides a concise and efficient way to manage data fetching and state synchronization in React applications. By abstracting away the complexities of asynchronous operations and providing a declarative API, React Query simplifies the development process and improves the overall performance and maintainability of React applications. With its caching, error handling, and integration features, React Query empowers developers to build robust and responsive user interfaces with minimal effort. Whether you're fetching data from a remote server, managing local state, or implementing optimistic updates, React Query offers a comprehensive solution for all your data fetching needs in React applications.

**How to set up react query** 
![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/eu15tafa93hec80d4lyb.png)

**refetchOnWindowFocus: false:**

This configuration option determines whether queries should automatically refetch data when the window gains focus.
When set to false, it disables automatic refetching of data when the window is focused.
This option can be useful in scenarios where you want to prevent unnecessary refetching of data when the user switches between tabs or windows.

**retry: 0:**

This configuration option specifies the number of automatic retry attempts that should be made for failed queries.
When set to 0, it disables automatic retries for failed queries.
In situations where a network request fails, React Query can automatically retry the request a certain number of times based on this configuration.
Setting it to 0 means that no automatic retry attempts will be made, and it's up to the developer to handle error recovery or retry logic manually if needed.

In summary, refetchOnWindowFocus: false disables automatic data refetching when the window gains focus, while retry: 0 disables automatic retry attempts for failed queries. These configuration options provide fine-grained control over the behavior of data fetching and error handling in React Query.

**Version**
  "@tanstack/react-query": "^4.33.0",