AJAX (Asynchronous JavaScript and XML) allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. In JavaScript, the XMLHttpRequest object is used to interact with servers.

This example loads content from a local readme.txt file and displays it when the request is successful (status 200).

This example displays an error message if the file does not exist (status 404).

This example fetches data from a public API and logs the JSON response in the browser console.

This example parses JSON from an API and displays the post titles in a list format on the webpage.

This example sends JSON data to a public API using POST and logs the response in the console.