Use toFixed() with parseFloat to get output numbers up to 2 decimals in JavaScript.
parseFloat(yourString).toFixed(2)If you need performance (like in games), use the math round method.
Math.round(number * 100) / 100It’s about 100 times as fast as parseFloat(number.toFixed(2))
JavaScript parseFloat 2 decimals
Simple example code.
 <!DOCTYPE html>
 <html>
 <body>
  <script>
    var str = "100";
    var twoPlacedFloat = parseFloat(str).toFixed(2);
    console.log(twoPlacedFloat);
  </script>
</body>
</html> Output:

Do comment if you have any doubts or suggestions on this JS parseFloat topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version