score:1

You can use the following chart plugin to show/use the same labels/ticks on two different y-axis :

Chart.plugins.register({
   beforeInit: function(chart) {
      chart.options.scales.yAxes[1].ticks.suggestedMin = Math.min.apply(this, chart.data.datasets[0].data);
      chart.options.scales.yAxes[1].ticks.suggestedMax = Math.max.apply(this, chart.data.datasets[0].data);
   }
});

- add this at the beginning of your script

ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ

Chart.plugins.register({
   beforeInit: function(chart) {
      chart.options.scales.yAxes[1].ticks.suggestedMin = Math.min.apply(this, chart.data.datasets[0].data);
      chart.options.scales.yAxes[1].ticks.suggestedMax = Math.max.apply(this, chart.data.datasets[0].data);
   }
});

var chart = new Chart(ctx, {
   type: 'line',
   data: {
      labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May'],
      datasets: [{
         label: 'LINE',
         data: [3, 1, 4, 2, 5],
         backgroundColor: 'rgba(0, 119, 290, 0.2)',
         borderColor: 'rgba(0, 119, 290, 0.6)',
         fill: false
      }]
   },
   options: {
      scales: {
         yAxes: [{
            id: 'y-axis-0',
            position: 'left',
            ticks: {
               stepSize: 1
            }
         }, {
            id: 'y-axis-1',
            position: 'right',
            ticks: {
               stepSize: 1
            }
         }]
      }
   }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="ctx"></canvas>


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