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Learn how to efficiently execute multiple async API callouts in parallel using Node.js with `async/await` for better performance and faster data retrieval.
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This video is based on the question https://stackoverflow.com/q/62564610/ asked by the user 'Richard Lewis' ( https://stackoverflow.com/u/7838769/ ) and on the answer https://stackoverflow.com/a/62564726/ provided by the user 'Cameron Tacklind' ( https://stackoverflow.com/u/4612476/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Parallel Async/Await API Callouts in Node.js

Are you struggling to optimize your API callouts using async/await in Node.js? If so, you're not alone! Many developers face challenges when fetching data from multiple sources simultaneously. In this guide, we'll explore how to make multiple asynchronous API calls in parallel, ensuring your application runs efficiently without unnecessary delays.

Understanding the Problem

In a recent query, a developer expressed difficulty in making three API callouts to retrieve Google Drive metadata in parallel. The callouts were fetching metadata for folders and files but were running in series due to the use of await. This not only slowed down the process but made the code cumbersome.

To simplify, let’s break down the basic structure of how these API callouts were initially structured:

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As seen above, each API call waits for the previous call to complete before initiating the next one, which leads to decreased efficiency.

Solution: Using Promise.all()

To resolve this issue, we can utilize Promise.all() to run the calls in parallel. This approach combines multiple promises, allowing all specified promises to execute simultaneously. Here’s how you can refactor the original code:

Step 1: Create Promises for Each API Call

First, define the API calls as promises, just as you did before, but do not use await:

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Step 2: Combine Promises with Promise.all()

Next, use Promise.all() to run all the promises in parallel:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Handle Results Properly

The results returned from Promise.all() will be an array. You can use destructuring to handle individual results easily:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

By using Promise.all(), you can significantly enhance the performance of your API calls. This method not only simplifies your code by allowing multiple asynchronous requests to run in parallel but also improves the response time in your applications.

Remember to wrap your promise calls in a try-catch block if you are using async/await in other parts of your code to handle any potential errors gracefully.

Implement these practices in your future projects to optimize the performance of your Node.js applications effectively. Happy coding!