Adding a 'thousands' separator to ChartJS's Y axis and tooltips

I learned the toLocaleString() method for adding thousands separators from this Github issue (https://github.com/chartjs/Chart.js/issues/411)

These options in your options config will add a thousands separator to your tooltips and yAxes.

options: {
    tooltips: {
        callbacks: {
            label: function(tooltipItems, data) {
                return data.labels[tooltipItems.index] + ": " + data.datasets[0].data[tooltipItems.index].toLocaleString();
            }
        }
    },
    scales: {
        yAxes: [
            {
                ticks: {
                    beginAtZero: false,
                    callback: function(value, index, values) {
                        return value.toLocaleString();
                    }
                }
            }
        ]
    }
}