How to stop multiple calls of the same query using React- query ?

When using React-query, a common challenge is avoiding multiple unnecessary requests for the same query. React-query itself provides caching and deduplication features to address this issue. Here are some steps and techniques to ensure we effectively leverage React-query to prevent duplicate queries:

1. Using Query Keys to Uniquely Identify Each Query

React-query uses query keys to uniquely identify each data query. If multiple components or features require the same data, they should share the same query key. React-query automatically recognizes this and makes only a single request.

Example:

Suppose we fetch user information across multiple components:

jsx
const { data: user } = useQuery(['user', userId], fetchUser);

Regardless of how many times this hook is invoked in the application, React-query ensures only one request is made if the userId is identical.

2. Configuring Query Cache Duration

In React-query, you can define the time period during which data is considered fresh by setting staleTime. During this period, any request for the same query directly returns the cached result without triggering a new network request.

Example:

jsx
const { data: user } = useQuery(['user', userId], fetchUser, {
  staleTime: 1000 * 60 * 5, // Data is fresh for 5 minutes
});

This ensures that multiple renders or re-renders of the component during the freshness window do not trigger additional network requests.

3. Dynamically Controlling Query Execution with the enabled Option

Sometimes, we may only want to execute a query when specific conditions are met. The enabled configuration option allows us to dynamically enable or disable the query based on conditions.

Example:

jsx
const { data: profile } = useQuery(['profile', userId], fetchUserProfile, {
  enabled: userId !== null, // Only enable when `userId` exists
});

This ensures network requests are made only when the data is actually needed, avoiding unnecessary calls.

4. Leveraging React-query's Prefetching Feature

React-query provides a prefetching feature that fetches and caches results before the data is actually needed. This is implemented through the queryClient.prefetchQuery method.

Example:

jsx
const queryClient = useQueryClient();

// Prefetch data before user interaction
const prefetchProfile = (userId) => {
  queryClient.prefetchQuery(['profile', userId], () => fetchUserProfile(userId));
};

This helps reduce user waiting time and further minimizes duplicate data requests during user interactions.

By applying these strategies, we can effectively utilize React-query's features to optimize data loading behavior, thereby enhancing performance and user experience.