How to handle asynchronous operations with async/await?

[anujgaurave]

JavaScript: How to handle asynchronous operations with async/await?

Hi everyone,

I have been working with asynchronous JavaScript and using async/await for handling promises. However, I am running into some issues when I have multiple asynchronous operations that depend on one another.

Could someone explain the best way to handle these scenarios? For instance, how can I ensure that one asynchronous operation waits for another to complete? Here's a simplified example of what I am trying to achieve:

async function fetchData() {
  try {
    const response1 = await fetch('https://api.example.com/data1');
    const data1 = await response1.json();

    const response2 = await fetch(`https://api.example.com/data2/${data1.id}`);
    const data2 = await response2.json();

    console.log(data2);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
}

fetchData();

[Sachin2815]

Handling Asynchronous Operations with async/await in JavaScript

Working with asynchronous operations in JavaScript using async/await can dramatically simplify your code and make it more readable. Especially when dealing with operations that depend on one another, async/await helps avoid the dreaded "callback hell" or excessive .then() chaining, while keeping the logic flow intuitive and clean.

Understanding async/await

In your case, you're trying to:

1. Fetch data from one API endpoint.
2. Use the result of that first fetch to query a second API.

This is a classic case where async/await shines because it allows you to write asynchronous code in a synchronous style, making the dependency between operations much clearer.

Solution Explanation

Here’s how you can structure your code:

async function fetchData() {
  try {
    // Step 1: Fetch the first piece of data
    const response1 = await fetch('https://api.example.com/data1');
    const data1 = await response1.json();

    // Step 2: Use the result from data1 to fetch the second resource
    const response2 = await fetch(`https://api.example.com/data2/${data1.id}`);
    const data2 = await response2.json();

    // Output the final result
    console.log(data2);
  } catch (error) {
    // In case of any error during the fetch process
    console.error('Error fetching data:', error);
  }
}

fetchData();