JSFiddle - React, Tailwind, and code Playground

HTML

<input id="test" type="number" value="13.37" step="0.1" />
<input id="test2" type="decimal" value="13,38" />

JavaScript

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

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

console.log(element, value, pretty);