To get the length of a string in JavaScript, use the length property. The length property returns the number of characters in a string.
Example
You can try to run the following code to learn how to get the length of a string
<html>
<head>
<title>JavaScript String length Property</title>
</head>
<body>
<script>
var str = new String( "Tutorialspoint Tutorials" );
document.write("Length of string:" + str.length);
</script>
</body>
</html>