JSFiddle - React, Tailwind, and code Playground

HTML

<input name="txtMSExMarCardFee" type="number" id="txtMSExMarCardFee" class="Stylednumber">
<input name="txtMSExMarCardFee1" type="number" id="txtMSExMarCardFee1" class="Stylednumber">
<input name="txtMSExMarCardFee2" type="number" id="txtMSExMarCardFee2" class="Stylednumber">

JavaScript

$('input.Stylednumber').keyup(function(){
						var x=$(this).val();
						x=x.toString();
						var afterPoint = '';
						if(x.indexOf('.') > 0)
						afterPoint = x.substring(x.indexOf('.'),x.length);
						x = Math.floor(x);
						x=x.toString();
						var lastThree = x.substring(x.length-3);
						var otherNumbers = x.substring(0,x.length-3);
						if(otherNumbers != '')
						lastThree = ',' + lastThree;
						var res = otherNumbers.replace(/\B(?=(\d{2})+(?!\d))/g, ",") + lastThree + afterPoint;
						
		 
						$(this).val(res );
						
					});