Bumping into the error “xmlhttprequest is not defined” while operating your JavaScript coding without knowing how to address such a problem? Understanding your needs, here we have come up with the most state-of-the-art and in depth instruction.

Wait for no more but jump right into and rack up the best to your fingertips!

Why Does The Error “Xmlhttprequest Is Not Defined” Happen?

There are two primary causes for the “XMLHttpRequest is not defined” error. Let’s scroll down to check out what they are and how we can get them resolved!

Reason #1: The XMLHttpRequest cannot be used in a Node.js application (on the server side).

This occurrence happens since only web browsers have native support for the XMLHttpRequest type. However, such a case can still be fixed once you know how. Although it is not a component of Node, npm can be used to install it as a package.

To once more manage under Node (and behold the error), enter:

node test.js

Test.js:

var xhr = new XMLHttpRequest();

xhr.open("GET", "/demo/book.json");

 xhr.onreadystatechange = function () {

    console.log("readyState = " + this.readyState + ", status = " + this.status);

    if (this.readyState == 4 && this.status == 200) {

        var result = this.responseText;

        console.log(result);

    }

};

xhr.send();

Output:

var xhr = new XMLHttpRequest();

              ^

ReferenceError: XMLHttpRequest is not defined

For further details on the solutions, read on!

Reason #2: XMLHttpRequest keyword misspelling (case sensitive).

Believe it or not, the chances that you may make silly mistakes like so is vastly high. It is not to mention there are numerous areas regarding this spectrum where you could fail to be accurate. 

That is why double-checking if the word XMLHttpRequest is spelled correctly will never go redundant in any case.

Xmlhttprequest Is Not Defined – How To Fix?

As for the second explanation, it is simple to get an appropriate cure since all you need to do is to merely determine the typo and rewrite it the right way. Nevertheless, things become a bit more complicated when it comes to the first cause.

To resolve the “XMLHttpRequest is not defined” error, we must first install a different package, such as node-fetch or axios, which are more recent and user-friendly ways to communicate with a server.

Users can also employ the xhr2 package if you need to replace XMLHttpRequest with a Node.js-compatible alternative. Have a look at the below steps to grasp more!

• Step 1: Make use of npm to install xmlhttprequest.

Running the code:

npm install xmlhttprequest --save

• Step 2: Add to need (“xmlhttprequest”).

Now, the code will function in nodes. Note that the first line is the only new line and the rest is identical.

Test.js (updated):

var XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;

var xhr = new XMLHttpRequest();

xhr.open("GET", "/demo/book.json");

xhr.onreadystatechange = function () {

    console.log("readyState = " + this.readyState + ", status = " + this.status);

    if (this.readyState == 4 && this.status == 200) {

        var result = this.responseText;

        console.log(result);

    }

};

xhr.send();

Conclusion

Above is all that you need to know regarding how to fix the “xmlhttprequest is not defined” error. Hopefully, the instructions outlined can anyhow help you address your issue. See you then!