Node.js — Async Await

Basic Syntax

async function fetchData() {
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    return data;
}

Error Handling

async function fetchData() {
    try {
        const response = await fetch('https://api.example.com/data');
        if (!response.ok) throw new Error('HTTP error');
        return await response.json();
    } catch (error) {
        console.error('Fetch failed:', error);
        throw error;
    }
}

Parallel Execution

async function loadData() {
    const [users, posts] = await Promise.all([
        fetchUsers(),
        fetchPosts()
    ]);
    return { users, posts };
}

Top-Level Await

// In ES modules
const data = await import('./module.js');

For Loop

async function processItems(items) {
    for (const item of items) {
        await processItem(item);
    }
}

Mini Practice

1. Convert promises to async/await
2. Handle errors with try-catch
3. Run async functions in parallel
4. Use async in loops

Up Next

Continue with JSON — working with JSON data.