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Hòa Nguyễn Coder@hoanguyencoder•Oct 15, 2025
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How to Fix Memory Leaks in React Applications

Avatar of freecodecampfreeCodeCamp•From freecodecamp.org•Sep 24, 2025•9m read time

Memory leaks in React applications occur when components create resources like event listeners, timers, or subscriptions but fail to clean them up during unmounting. This causes applications to consume increasing amounts of RAM, leading to slowdowns and crashes. The guide demonstrates how to fix common memory leak sources by properly cleaning up event listeners with removeEventListener, clearing timers with clearInterval/clearTimeout, unsubscribing from external data sources, and canceling API requests using AbortController in useEffect cleanup functions.

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Hòa Nguyễn Coder
@hoanguyencoder
Joined Oct 29. 2024
1.6K

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