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xmlDoc.getElementsByTagName is not a function

Ran HTML through local server so that parse a text file that is written in XML format. Inside the XMLHttpRequest function, I am able to print the node of the xmlDoc variable I want. But then outside the XMLHttpRequest function, it basically forgets what is stored in the xmlDoc variable.

Why, am I not able to bring the parsed XML xmlDoc variable output out of the XMLHttpRequest function?

HTML

<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
</body>
<script>
    var xmlDoc = new DOMParser();
    var xhttp = new XMLHttpRequest();

    xhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            parser = new DOMParser();
            xmlDoc = parser.parseFromString(this.responseText,"text/xml");
            console.log(xmlDoc.getElementsByTagName("title")[0].childNodes[0].nodeValue)
        }
    };
    xhttp.open("GET", "project_content.txt", true);
    xhttp.send();

    console.log(xmlDoc.getElementsByTagName("title")[0].childNodes[0].nodeValue)
</script>
</html>

TXT File

<projects>
    <mini_title>
        COVID-19 POWER BI
    </mini_title>
    <title>
        COVID-19 POWER BI
    </title>
    <techniques>
        SQL, DAX, Micorsoft SQL Sever, and Power BI
    </techniques>
    <about>
        random text
    </about>

    <mini_title>
        FOREX ML TRADER
    </mini_title>
    <title>
        FOREX MACHINE LEARING AUTO TRADER
    </title>
    <techniques>
        Python, Object-Oriented Programming, GUI, MetaTrader 5 Python Package, and Machine Learning
    </techniques>
    <about>
        random text
    </about>

</projects>

Expected outcome (chrome console):

COVID-19 POWER BI
COVID-19 POWER BI

Actual outcome (chrome console):

[tester.html:57 Uncaught TypeError: xmlDoc.getElementsByTagName is not a function at tester.html:57

tester.html:51 COVID-19 POWER BI

]1

almost 3 years ago · Juan Pablo Isaza
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