👀 Views: 490 💬 Answers: 1 📅 Created: 2025-07-22

react useEffect state-management JavaScript

I'm migrating some code and Quick question that's been bugging me - I've searched everywhere and can't find a clear answer... I'm currently working with an scenario where my component's state is not updating as expected after a data fetch. I'm using React 17 with functional components and hooks. I have a situation where I fetch some data from an API and then set that data into the state. However, when trying to use that updated state in a subsequent effect, I find that it's still reflecting the old state. Here's a simplified version of my code: ```javascript import React, { useState, useEffect } from 'react'; function MyComponent() { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchData = async () => { const response = await fetch('https://jsonplaceholder.typicode.com/posts/1'); const result = await response.json(); setData(result); setLoading(false); }; fetchData(); }, []); useEffect(() => { if (data) { console.log('Data loaded:', data); // Trying to do something with data here... } }, [data]); if (loading) return <div>Loading...</div>; return <div>{data.title}</div>; } ``` The question arises because when I log `data` in the second `useEffect`, it still shows `null` right after the first fetch completes. I also verified that the API is returning the correct response. I've checked the dependencies of the effect, and I am sure that `data` should trigger the second `useEffect`. I tried adding a console log directly after `setData(result)` to confirm that the state is being set, and it seems to be firing correctly. Any idea why the updated `data` isn't available in the second effect? Is there something I'm missing regarding asynchronous state updates in React or the timing of these hooks? My development environment is Windows. What am I doing wrong? This is part of a larger application I'm building. Any help would be greatly appreciated! Any pointers in the right direction? I'm working in a Debian environment. Cheers for any assistance!