What are some examples of using async/await in Node.js?

Can you explain async/await in Node.js with some examples?

Sure! Async/await is a way to handle asynchronous operations in Node.js. It makes your code look synchronous, which is easier to read. For example, here's a simple function that fetches data from an API:

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

This function uses await to pause execution until the promise is resolved.

Can you show me a more complex example?

Absolutely! Here's a more complex example that fetches user data and their posts:

const fetchUserData = async (userId) => {
    const userResponse = await fetch(`https://api.example.com/users/${userId}`);
    const user = await userResponse.json();
    const postsResponse = await fetch(`https://api.example.com/users/${userId}/posts`);
    const posts = await postsResponse.json();
    return { user, posts };
};

This function fetches user data and their posts sequentially.

What happens if one of the fetch calls fails?

Good question! If one of the fetch calls fails, it will throw an error. You can handle this using a try/catch block:

const fetchUserData = async (userId) => {
    try {
        const userResponse = await fetch(`https://api.example.com/users/${userId}`);
        const user = await userResponse.json();
        const postsResponse = await fetch(`https://api.example.com/users/${userId}/posts`);
        const posts = await postsResponse.json();
        return { user, posts };
    } catch (error) {
        console.error('Error fetching data:', error);
    }
};

Thanks! This really helps me understand async/await better.