Bugs
JavaScript Async/Await Mistakes: What Goes Wrong
Missing await, sequential execution where parallel is possible, and unhandled rejections are extremely common in JavaScript async code.
❌ Sequential Instead of Parallel
async function loadDashboard(userId) {
const user = await fetchUser(userId);
const posts = await fetchPosts(userId); // Waits for user first
const notifs = await fetchNotifications(userId); // Waits for posts
return { user, posts, notifs };
}✅ Parallel with Promise.all
async function loadDashboard(userId) {
const [user, posts, notifs] = await Promise.all([
fetchUser(userId),
fetchPosts(userId),
fetchNotifications(userId)
]);
return { user, posts, notifs };
}💡
Pro tip: Use Promise.all() for independent async operations. Total time becomes the slowest single call instead of the sum of all calls.
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