Mastering Async/Await in JavaScript
Learn how to write clean asynchronous code using async/await in JavaScript.
What is Async/Await?
Async/await is syntactic sugar over Promises, making asynchronous code look synchronous.
Basic Syntax
async function fetchData() {
const response = await fetch('/api/data');
const data = await response.json();
return data;
}
Error Handling
Use try/catch for error handling:
async function fetchUser() {
try {
const response = await fetch('/api/user');
return await response.json();
} catch (error) {
console.error('Error:', error);
}
}
Parallel Execution
Use Promise.all for concurrent requests:
async function fetchAll() {
const [users, posts] = await Promise.all([
fetch('/api/users').then(r => r.json()),
fetch('/api/posts').then(r => r.json())
]);
}
Common Mistakes
- Forgetting await keyword - Using await in non-async functions - Sequential instead of parallel execution when possible
Best Practices
- Always handle errors - Use Promise.all for independent operations - Keep async functions focused and small