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Memory Leak in React with useEffect and Object References

👀 Views: 43 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-14
react memory-leak useEffect JavaScript

I'm having trouble with I'm integrating two systems and I've been working on this all day and I'm working on a personal project and I'm encountering a memory leak issue in my React application where I'm using `useEffect` to manage state based on an object reference..... The component renders a list of items fetched from an API, and I'm storing this list in state. When I update the list, the old reference to the state object seems to persist, causing the component not to unmount properly and leading to increased memory usage over time. I'm using React 17.0.2 and here's a snippet of what I have: ```javascript import React, { useState, useEffect } from 'react'; const ItemList = () => { const [items, setItems] = useState([]); useEffect(() => { const fetchData = async () => { const response = await fetch('https://api.example.com/items'); const data = await response.json(); setItems(data); }; fetchData(); return () => { setItems([]); // Trying to clean up }; }, []); return ( <ul> {items.map(item => <li key={item.id}>{item.name}</li>)} </ul> ); }; export default ItemList; ``` Despite calling `setItems([])` in the cleanup function of `useEffect`, I still see the old references when I check memory usage in Chrome DevTools. I've tried using the functional form of `setItems` and also checked if any other components are holding references to the same state object. I suspect the issue could be related to how React batches state updates or how closures work in this context, but I'm not sure. Any insights on how to properly handle this situation and prevent memory leaks would be greatly appreciated. My development environment is Windows. The project is a microservice built with Javascript. How would you solve this? Thanks, I really appreciate it! For reference, this is a production REST API.