Uncaught TypeError: Cannot Set 'responseText' Property of XMLHttpRequest - Solution and Example

This error occurs when you try to set the 'responseText' property of an 'XMLHttpRequest' object that only has a getter method for this property. The 'responseText' property is read-only and cannot be directly modified.

To resolve this issue, you need to make sure you are using the 'XMLHttpRequest' object correctly. Instead of setting the 'responseText' property directly, you should use the 'responseText' value returned by the 'XMLHttpRequest' object after making a request.

Here is an example of how to use the 'XMLHttpRequest' object correctly:

var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://example.com/api/data', true);

xhr.onload = function() {
  if (xhr.status === 200) {
    var responseText = xhr.responseText;
    // Do something with the responseText
  }
};

xhr.send();

In this example, the 'onload' event handler is used to handle the response received from the server. The 'responseText' value is accessed through the 'xhr.responseText' property, which is read-only and cannot be modified.