---
title: "How can you handle asynchronous API calls in a client-side application?"  
description: "How can you handle asynchronous API calls in a client-side application?"  
author: "Rocky Dada"  
published: 2023-08-30  
updated: 2023-08-30  
canonical: https://www.mindstick.com/forum/159792/how-can-you-handle-asynchronous-api-calls-in-a-client-side-application  
category: "web api"  
tags: ["c#", ".net", "web api", ".net core api"]  
reading_time: 2 minutes  

---

# How can you handle asynchronous API calls in a client-side application?

[Discuss the importance](https://www.mindstick.com/forum/158648/discuss-the-importance-of-monitoring-and-observability-in-microservices) of [asynchronous programming](https://www.mindstick.com/articles/338169/exploring-the-power-of-asynchronous-programming-in-c-sharp) in client-side [applications](https://www.mindstick.com/articles/12847/how-to-choose-the-right-ethernet-cable-for-industrial-applications) when consuming APIs. [Explain](https://www.mindstick.com/forum/157854/what-is-system-debugging-explain-some-system-debugging-tools-used-in-modern-computer-systems) how to use [JavaScript](https://www.mindstick.com/articles/874/how-to-create-watermark-text-for-textbox-by-using-javascript)'s asynchronous [features](https://www.mindstick.com/articles/12993/5-advanced-features-for-your-odoo-ecommerce-theme) like [Promises](https://www.mindstick.com/forum/160100/how-do-promises-in-javascript-simplify-asynchronous-code-compared-to-callbacks) or async/await.

## Replies

### Reply by Aryan Kumar

There are a few ways to handle [asynchronous](https://www.mindstick.com/blog/178/synchronous-and-asynchronous-command-execution-in-c-sharp-dot-net) API calls in a client-side application. One way is to use the `async` and `await` keywords in JavaScript. These keywords allow you to write code that runs asynchronously, meaning that it does not block the main thread of execution.

Here is an example of how to use the `async` and `await` keywords to handle an asynchronous API call:

```plaintext
const response = await fetch('https://api.example.com/users');

if (response.ok) {
  const users = await response.json();
  // Do something with the users.
} else {
  // Handle the error.
}
```

Another way to handle asynchronous API calls is to use a promise. A promise is an object that represents a future value. When you call a function that returns a promise, the function will not return immediately. Instead, it will return a promise that will eventually resolve with the value of the function.

Here is an example of how to use a promise to handle an asynchronous API call:

```plaintext
const promise = fetch('https://api.example.com/users');

promise.then(response => {
  if (response.ok) {
    const users = response.json();
    // Do something with the users.
  } else {
    // Handle the error.
  }
});
```

Finally, you can also use a callback function to handle asynchronous API calls. A callback function is a function that is passed as an argument to another function. The callback function is called when the other function finishes executing.

Here is an example of how to use a callback function to handle an asynchronous API call:

```plaintext
fetch('https://api.example.com/users', (response) => {
  if (response.ok) {
    const users = response.json();
    // Do something with the users.
  } else {
    // Handle the error.
  }
});
```

The best way to handle asynchronous API calls in a client-side application will depend on the specific needs of your application. You should consider the factors such as the complexity of the API call, the performance requirements of your application, and the familiarity of your developers with the different techniques.


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Original Source: https://www.mindstick.com/forum/159792/how-can-you-handle-asynchronous-api-calls-in-a-client-side-application

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