JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>

JavaScript

$(function () {
    $(document).ready(function () {
        function parseData(data) {
            var data = JSON.parse(event.data);
            var dates = $.map(data.payload.now_str.split("-"), function(s) { return parseInt(s); });
            var year = dates[0];
            var month = dates[1] - 1;
            var day = dates[2];
            var hour = dates[3];
            var minute = dates[4];
            var second = dates[5];
            var x = new Date(year, month, day, hour, minute, second);
            var y = parseInt(data.payload.participants_text.replace(",", ""));
            return [x, y];
        }            
        
        Highcharts.setOptions({
            global: {
                useUTC: false
            }
        });
        
        var socket = new WebSocket("wss://wss.redditmedia.com/thebutton?h=aebb1b65a8906454ef0e30840c0f1efcf6c92ae5&e=1428018254");
        socket.onopen = function(event) {
            console.debug('Opened. Waiting for initial data.');
        }        
        var data = [];        
        socket.onmessage = function(event) {
            data.push(parseData(event.data));
            console.debug('Waiting for more data...');
            if(data.length > 2) {
                socket.close();
                console.debug('Creating chart...');
                $('#container').highcharts({
                    chart: {
                        type: 'spline',
                        animation: Highcharts.svg, // don't animate in old IE
                        marginRight: 10,
                        events: {
                            load: function () {
                                var series = this.series[0];
                                var socket = new WebSocket("wss://wss.redditmedia.com/thebutton?h=dc548828730e7719a906a829ffcbce780f784691&e=1428014361");
                                    
                                socket.onopen = function(event) {
                                   ...