JSFiddle - React, Tailwind, and code Playground

HTML

<input id="test" type="number" value="13.37" />
<span></span>

JavaScript

var element = document.getElementById("test");
var value = element.value;

var decimalValue = Number(value);
var pretty = decimalValue.toLocaleString();
var str = element.value;

console.info(navigator.language);
console.log(element, value, pretty);