[basic data] read json from url (d3 v4)

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <div id="result"></div>
  <script>
    //https://stackoverflow.com/questions/9922101/get-json-data-from-external-url-and-display-it-in-a-div-as-plain-text
      var getJSON = function(url, callback) {
          var xhr = new XMLHttpRequest();
          xhr.open('get', url, true);
          xhr.responseType = 'json';
          xhr.onload = function() {
            var status = xhr.status;
            if (status == 200) {
              callback(null, xhr.response);
            } else {
              callback(status);
            }
          };
          xhr.send();
      };
    
getJSON('https://api.github.com/users/mralexgray/repos', function(err, data) {
  if (err != null) {
    alert('Something went wrong: ' + err);
  } else {
    alert('Your Json result is:  ' + data.result);
    for (a in data) {
      result.innerText = result.innerText + data[a].name + "\n";
    }
    //result.innerText = data[0].id;
  }
});    
    
		//https://stackoverflow.com/questions/8292050/is-there-any-publically-accessible-json-data-source-to-test-with-real-world-data
    //https://api.github.com/users/mralexgray/repos
  </script>
</body>

https://d3js.org/d3.v4.min.js