Скачать или смотреть How to Use Async/Await for Node.js API Calls

Discover how to effectively use `async/await` for API calls in Node.js, ensuring functions execute in the correct order.
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How to Use Async/Await for Node.js API Calls: A Step-by-Step Guide

In the world of asynchronous programming, especially with Node.js, one common challenge developers face is ensuring that functions execute in the correct order. This is especially important when certain functions depend on the results of others, such as API calls. In this post, we will explore how to use the powerful async/await syntax to manage asynchronous calls effectively.

The Problem: Why Your Functions Run Out of Order

Imagine you are trying to add a contact to a mailing list using the Mailjet API. You first need to create a contact, and only after that should you add that contact to the mailing list. However, if you don't manage the order of these calls correctly, the addition to the mailing list might execute before the contact is fully created. This can lead to frustrating errors and unexpected behaviors in your application.

You Might Encounter Issues Like:

Attempting to add an email address to a mailing list that hasn't been created yet.

Getting inconsistent results or errors from your API calls.

The Solution: Using Async/Await Properly

Using async/await helps you write cleaner code that is easier to read and maintain. Here’s how you can implement async/await properly in your code.

Here's the Original Function

Let's take a look at the initial setup:

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

Key Changes to Make

Return a Promise: Modify the createContact function so that it returns a Promise, which can then be awaited.

Await the Addition: Ensure that when you call addEmailToList, it is also awaited, which will ensure that the email is added only after the contact has been successfully created.

Updated createContact Function

Here's the updated code for createContact:

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

Updated addEmailToList Function

You should also ensure that addEmailToList is structured to return a Promise:

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

Putting It All Together

With the changes above, your router code should look like this:

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

Conclusion

Handling asynchronous operations can be tricky, but using async/await effectively helps ensure that your functions execute in the correct order. By modifying your createContact and addEmailToList functions to return Promises, you can ensure that your code remains clean, structured, and error-free. If you encounter issues, consider checking the flow and structure of your promises and make sure each asynchronous function is awaited properly.

By following the steps outlined above, you can tackle similar issues in your code easily in the future.

Should you have any further questions or require more clarification on Node.js or async/await, feel free to ask!