[Chartjs]-How to apply dollar sign in Y- axis in chart js?

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If you are using version 1.x of Chart.js, you can customize the ticks using the scaleLabel key.

var options = {
   scaleLabel: function(label){return  '$' + label.value}
};

Note that when creating the chart, you should pass the options object as the second argument instead of including it in your monthsData.

const labels = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec'];
const initialData = [{'x':'Apr', 'y':40},{'x':'July', 'y':70},{'x':'Dec', 'y':120}];

const filledMonths = initialData.map((month) => month.x);
const dataSet = labels.map(month => {
  const indexOfFilledData = filledMonths.indexOf(month);
	if( indexOfFilledData !== -1) return initialData[indexOfFilledData].y;
  return 0;
});

var monthsData = {
    labels: labels,
    datasets: [
        {
            label: "My First dataset",
            fillColor: "rgba(220,220,220,0.2)",
            strokeColor: "rgba(220,220,220,1)",
            pointColor: "rgba(220,220,220,1)",
            pointStrokeColor: "#fff",
            pointHighlightFill: "#fff",
            pointHighlightStroke: "rgba(220,220,220,1)",
            data: dataSet
        }
    ]
};

var options = {
   scaleLabel: function(label){return  '$' + label.value}
};

var ctx = document.getElementById("myChart").getContext("2d");

var chart = new Chart(ctx).Line(monthsData, options);
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.1.1/Chart.min.js"></script>
<canvas id="myChart" width="300" height="300"></canvas>

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