How To Format Scale Numbers in Chart.js v2

When adding option configurations, you need to make sure you nest the settings in the right sections. You can format the scale numbers by adding a callback function to the yAxes ticks configuration section:

options = {
    scales: {
        yAxes: [{
            ticks: {
                callback: function(value) {
                    return value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
                }
            }
        }]
    }
};

JSFiddle Demo: https://jsfiddle.net/2n7xc7j7/1/

In V3 the locale property has been added. This makes it so all the numbers on the scales an tooltips get formatted correctly automatically in the numberformat of that country code:

// Element
const ctx = document.getElementById("myChart")

// Data
const data = {
  labels: ['First', 'Second', 'Third', 'Fourth'],
  datasets: [{
    label: 'Sample',
    data: [2982, 1039, 3200, 2300],
    backgroundColor: "rgba(90, 150, 220, 0.85)",
    borderColor: "rgba(70, 120, 180, 1)",
    borderWidth: 2
  }],
}

// Options
const options = {
  locale: 'en-US'
};

const chart_trans_hari = new Chart(ctx, {
  type: 'bar',
  data: data,
  options: options
});

<canvas id="myChart"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.0/chart.js"></script>

I did this:

http://profwtelles.ddns.net/grafico2.html

    var canvas = document.getElementById('chart');
    new Chart(canvas, {
        type: 'line',
        data: {
            labels: ['1', '2', '3', '4', '5'],
            datasets: [{
                label: 'A',
                yAxisID: 'A',
                data: [100, 96, 84, 76, 69]
            }, {
                label: 'B',
                yAxisID: 'B',
                data: [1, 1, 1, 1, 0]
            }]
        },
        options: {
            scales: {
                yAxes: [{
                    id: 'A',
                    type: 'linear',
                    position: 'left',
                }, {
                    id: 'B',
                    type: 'linear',
                    position: 'right',
                    ticks: {
                        max: 1,
                        min: 0
                    }
                }]
            }
        }
    });

I hope to help you.
Best Regards