Modern JavaScript: Async/Await Best Practices

The Evolution of Async JS

JavaScript has evolved from callbacks to Promises, and finally to the syntax sugar we know as async/await. It makes asynchronous code look and behave a little more like synchronous code.

Sequential vs Parallel Execution

One common mistake is awaiting everything sequentially when it is not necessary.

// Slow: Sequential
const user = await getUser(id);
const posts = await getPosts(id);

// Fast: Parallel
const [user, posts] = await Promise.all([
  getUser(id),
  getPosts(id)
]);

Error Handling

Always use try/catch blocks when working with async/await to handle rejections gracefully.

try {
  const data = await fetchData();
} catch (error) {
  console.error('Fetch failed', error);
}