JSFiddle - React, Tailwind, and code Playground

JavaScript

var data = $.parseJSON('[{"Date":"2014-02-19","Count":"963"},{"Date":"2014-02-20","Count":"2638"},{"Date":"2014-02-21","Count":"1962"},{"Date":"2014-02-22","Count":"1122"},{"Date":"2014-02-23","Count":"1192"},{"Date":"2014-02-24","Count":"2204"},{"Date":"2014-02-25","Count":"1906"},{"Date":"2014-02-26","Count":"1362"}]');
console.log(data);
console.log(typeof data[0].Count);
data.forEach(function(d) {
    d.Count = +d.Count;
});
console.log(typeof data[0].Count);