JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript" src="http://highcharts.com/js/testing.js"></script>

<div id="container" style="height: 300px"></div>
<textarea style="min-width: 400px; min-height: 150px;"></textarea>

JavaScript

window.chart = new Highcharts.Chart({

    chart: {
        renderTo: 'container'
    },

    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    series: [{
         name: 'Tokyo',
         data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
      }, {
         name: 'New York',
         data: [-0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
      }, {
         name: 'Berlin',
         data: [-0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
      }, {
         name: 'London',
         data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
    }]

}, function(chart) { // on complete

   var csv = [],
       series = chart.series,
       i=0, l=series.length;
    
    csv.push( chart.xAxis[0].categories.join(',') )
    
    for(; i<l; i++)
        csv.push( series[i].options.data.join(',') );

    
    $('textarea').val( csv.join('\n') );
    
});