JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<br/><!-- Just so that JSFiddle's Result label doesn't overlap the Chart -->

<div id="chartContainer" style="height: 360px; width: 100%;"></div>
<a href="#" id="btn-download" download="chart.jpg" target="_blank">Get Base64 Image</a>

JavaScript

var chart = new CanvasJS.Chart("chartContainer",
{
		title: {
			text: "Exporting chart using toDataurl"
		},
		data: [
		{
			type: "pie",
			showInLegend: true,
			legendText: "{indexLabel}",
			dataPoints: [
				{ y: 4181563, indexLabel: "PlayStation 3" },
				{ y: 2175498, indexLabel: "Wii" },
				{ y: 3125844, indexLabel: "Xbox 360" },
				{ y: 1176121, indexLabel: "Nintendo DS"},
				{ y: 1727161, indexLabel: "PSP" },
				{ y: 4303364, indexLabel: "Nintendo 3DS"},
				{ y: 1717786, indexLabel: "PS Vita"}
			]
		}
		]
});

chart.render();

$("#btn-download").click(function () {
    
    var canvas = $(".canvasjs-chart-canvas").get(0);
    var dataURL = canvas.toDataURL('image/jpeg');
    console.log(dataURL);

    $("#btn-download").attr("href", dataURL);

});