String representation of a network error in Javascript

Is there a way to retrieve the actual error text in JavaScript when an error occurs on XMLHttpRequest? Even though it gets displayed in the console, it's challenging to access as a string.

For example:

var req = new XMLHttpRequest();
req.open('get', 'http://nowhere/', true);
req.send();

The following error message appears in the console:

GET http://nowhere/ net::ERR_NAME_NOT_RESOLVED

How can this be obtained using JavaScript?

Edit: Just to clarify, I specifically want to know how to handle network errors, such as cases where there is no response due to various reasons. This includes situations like when the host name cannot be resolved, the connection is refused, or when there is a CORS error.

javascriptajaxxmlhttprequest

Answer №1

Retrieve the server response by accessing either the responseText or responseXML property within the XMLHttpRequest object.

alert(req.responseText);

responseText - obtains the response data in string format.

responseXML - retrieves the response data as XML content.

To verify if there is an error with the ajax request, check if req.readyState equals 4 and if req.status is below 200, then access the error using req.statusText.

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