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Handling Uncaught TypeError in Async Function with Fetch in React - Specific Case

👀 Views: 32 đŸ’Ŧ Answers: 1 📅 Created: 2025-06-08
react async-await fetch error-handling JavaScript

I'm updating my dependencies and I'm collaborating on a project where I tried several approaches but none seem to work... I've searched everywhere and can't find a clear answer. I'm working with an `Uncaught TypeError: want to read properties of undefined (reading 'data')` when trying to access `response.data` in an async function that's making a fetch request within a React component. I have a functional component where I'm fetching user data from an API. The API returns the data structured as `{ user: { id: 1, name: 'John Doe' } }`, but when I attempt to access it, I'm getting this behavior. Here's the relevant part of my code: ```javascript import React, { useEffect, useState } from 'react'; const UserProfile = () => { const [user, setUser] = useState(null); useEffect(() => { const fetchUserData = async () => { try { const response = await fetch('https://api.example.com/user/1'); const data = await response.json(); setUser(data.user); } catch (behavior) { console.behavior('behavior fetching user data:', behavior); } }; fetchUserData(); }, []); return ( <div> {user ? <h1>{user.name}</h1> : <h1>Loading...</h1>} </div> ); }; export default UserProfile; ``` I've confirmed that the fetch URL works correctly and returns the expected JSON structure when tested in Postman. I also added console logs to check what `data` contains before calling `setUser(data.user)`, but it's still giving me the TypeError. I suspect it might have something to do with how I'm trying to access the data or the timing of when the fetch resolves. Any suggestions on what might be going wrong or how I can better handle the response? For context: I'm using Javascript on Linux. Any ideas what could be causing this? Is there a simpler solution I'm overlooking? I'm on Linux using the latest version of Javascript. I'd be grateful for any help.