React Query vs useEffect for Data Fetching: Which to Use

React Query vs useEffect for Data Fetching: Which to Use

React Query and useEffect both fetch data, but they suit different cases. Here is how to choose.

useEffect for Fetching

Fetching in useEffect with useState for data, loading, and error is the basic pattern. It works and is fine for simple apps with few fetches.

React Query for Server State

React Query is a library for server state. It handles caching, invalidation, refetching, loading and error states, retries, and pagination for you, removing most hand-written fetching logic.

When useEffect Is Enough

For simple apps with a few fetches where caching does not matter, useEffect is fine. It is built in and leaves no extra dependency.

When React Query Wins

For apps with many fetches, shared data across components, refetching on focus, pagination, and mutations, React Query removes a lot of boilerplate and handles concerns useEffect does not.

The Trade-off

useEffect: built in, more manual work, no caching. React Query: a dependency, less manual work, caching and invalidation handled. Match the tool to the app's actual complexity.

A Common Middle Path

Start with useEffect for learning, then adopt React Query when you have multiple components needing the same data or when hand-rolled caching becomes painful.

The Takeaway

Use useEffect for simple fetches in small apps. Use React Query for server state in real apps, where caching, invalidation, refetching, and pagination matter. Start with useEffect to learn, then adopt React Query when hand-rolled logic becomes painful.