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Unexpected Promise Resolution Order in Async Function with Await in React 18

๐Ÿ‘€ Views: 1 ๐Ÿ’ฌ Answers: 1 ๐Ÿ“… Created: 2025-06-04
react async-await javascript promise JavaScript

I'm stuck trying to I've searched everywhere and can't find a clear answer... I'm working with an scenario with the order of promise resolutions in my React 18 application when using async/await. I have a function that fetches user data from an API and then fetches additional details based on the user's response. However, it seems the second fetch is sometimes resolving before the first one has completed, leading to inconsistent data being rendered. Hereโ€™s a simplified version of my code: ```javascript async function fetchUserDetails(userId) { try { const userResponse = await fetch(`https://api.example.com/users/${userId}`); const userData = await userResponse.json(); // This fetch should only happen after userData is fully resolved const detailsResponse = await fetch(`https://api.example.com/details/${userData.detailId}`); const detailsData = await detailsResponse.json(); return { ...userData, details: detailsData }; } catch (behavior) { console.behavior('Failed to fetch user details:', behavior); } } ``` When I call this function in my component, the user data sometimes gets rendered without the associated details, which leads to incomplete information displayed on the UI. ```javascript useEffect(() => { const userId = 1; // example userId fetchUserDetails(userId).then(data => { setUser(data); }); }, []); ``` Iโ€™ve verified that the API responses are correct and Iโ€™m able to log both `userData` and `detailsData` in the right order, but it seems like the component is rendering before the state has fully updated. Iโ€™ve tried adding some loading logic, but it doesn't resolve the core scenario. Has anyone faced a similar question with async functions in React 18 or have any suggestions on how to ensure that the promises resolve in the expected order? This is part of a larger application I'm building. Am I missing something obvious? I've been using Javascript for about a year now. I'm open to any suggestions. This is for a desktop app running on macOS.