JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <script>
        
            var req;
            
            getReputation();
            
            function getReputation(){
                req = new XMLHttpRequest();
                req.open('GET', 'http://api.stackoverflow.com/1.0/users/401025/');
                req.onreadystatechange = processUser;
                req.send();
            }
            
            function processUser(){
                var res = JSON.parse(req.responseText);
                alert('test');
            }
        </script>
    </head>
</html>