JSFiddle - React, Tailwind, and code Playground

HTML

<p id='count_div'></p>

JavaScript

var prev_count = 1125;
var new_count = 1020.50;

var count_till = prev_count < new_count ? new_count : new_count;
jQuery({
  Counter: prev_count
}).animate({
  Counter: count_till
}, {
  duration: 7000,
  easing: 'swing',
  step: function() {
    jQuery("#count_div").html(this.Counter.toFixed(2).replace(/(\d)(?=(\d{3})+\.)/g, '$1,'));

  }
});