To get the title of a document, use the title property in JavaScript. You can try to run the following code to show the title of a document with JavaScript.
Example
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script>
var str = document.title;
document.write("Title: "+str);
</script>
</body>
</html>