---
title: "How does AJAX enable asynchronous communication with web servers?"  
description: "How does AJAX enable asynchronous communication with web servers?"  
author: "Sandra Emily"  
published: 2023-10-10  
updated: 2023-10-11  
canonical: https://www.mindstick.com/forum/160105/how-does-ajax-enable-asynchronous-communication-with-web-servers  
category: "javascript"  
tags: ["ajax", "javascript", "asynchronous"]  
reading_time: 2 minutes  

---

# How does AJAX enable asynchronous communication with web servers?

How does [AJAX](https://www.mindstick.com/articles/1541/check-availability-of-user-name-or-email-using-asp-dot-net-ajax-and-jquery) enable [asynchronous](https://www.mindstick.com/blog/178/synchronous-and-asynchronous-command-execution-in-c-sharp-dot-net) [communication](https://www.mindstick.com/articles/126321/5-fails-and-fixes-of-the-office-communication) with [web servers](https://answers.mindstick.com/qa/111695/how-do-i-deploy-my-applications-to-web-servers-or-cloud-platforms)?

## Replies

### Reply by Aryan Kumar

AJAX (Asynchronous JavaScript and XML) enables asynchronous communication with [web](https://www.mindstick.com/articles/12783/the-ultimate-bunch-of-free-web-design-resources) [servers](https://www.mindstick.com/news/2567/cyber-attack-on-aiims-delhi-s-servers-originated-in-china-say-gov-sources) by allowing web pages to make requests to the server and update parts of the page without requiring a full page reload. Here's a simplified explanation of how AJAX works:

**Creating an XMLHttpRequest Object**: AJAX typically starts by creating an XMLHttpRequest object in JavaScript. This object provides the ability to send HTTP requests to a server and handle the server's responses.

```plaintext
var xhr = new XMLHttpRequest();
```

**Defining a Callback Function**: You define a callback function that will be executed when the server responds. This function processes the server's data and updates the web page.

```plaintext
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    // Process the server's response here
  }
};
```

**Sending a Request**: You use the **xhr.open()** method to specify the type of request (GET, POST, etc.) and the URL you want to request.

The third parameter, **true**, indicates that the request should be asynchronous.

```plaintext
xhr.open('GET', 'https://example.com/api/data', true);
```

**Sending the Request**: After setting up the request, you use the **xhr.send()** method to initiate the request to the server.

```plaintext
xhr.send();
```

**Handling the Server's Response**: As the server processes the request and sends a response, the **onreadystatechange** callback function is triggered. You check the **readyState** and **status** properties to ensure the request is complete and successful (status code 200).

Inside the callback function, you can use **xhr.responseText** or other properties to access the data sent by the server. You can then update the web page with this data.

```plaintext
if (xhr.readyState === 4 && xhr.status === 200) {
  var responseData = xhr.responseText;
  // Update the web page with the server's data
}
```

By using AJAX, web pages can request and receive data from web servers in the background without causing the entire page to reload. This enables a smoother and more interactive user experience on the web.

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Original Source: https://www.mindstick.com/forum/160105/how-does-ajax-enable-asynchronous-communication-with-web-servers

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