How do you fetch data with useEffect and prevent memory leaks?
This tests useEffect async lifecycle and cleanup. A good answer places fetch inside useEffect, uses an ignore flag or AbortController to block state updates after unmount, and includes deps. A red flag is skipping cleanup and letting a late response set state.
This tests safe synchronization with an async external data source via useEffect. A strong response places fetch inside the setup function, declares reactive dependencies, and returns a cleanup handler. It prevents memory leaks and race conditions by using an AbortController to cancel in-flight requests or an ignore flag to discard results after unmount. A red flag is making the setup function async directly, omitting dependencies, or ignoring the risk of setting state on an unmounted component.
Read the original → react.dev
- #react
- #useeffect
- #data-fetching
- #cleanup
- #memory-leaks
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