To calculate the ln of a given number, use the Math.log() method in JavaScript. This method returns the natural logarithm (base E) of a number. If the value of a number is negative, the return value is always NaN.
Example
You can try to run the following code to get the ln of a given number −
<html>
<head>
<title>JavaScript Math log() Method</title>
</head>
<body>
<script>
var value = Math.log(2);
document.write("Value : " + value );
</script>
</body>
</html>