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I did some digging through the myLineChart object and found the path to get to the y axis ticks is:
myLineChart.ticks.boxes[0].chart.scales[โy-axis-0โ].ticks.
The snippet below shows me using that to output the lowest value.
Alternatively, if you upgrade chartJs to at least version 3.1(which is what I am using on a project) the chart object structure is much easier to navigate. In ChartJs 3.1 the answer would looke like: myLineChart.scales.y.min
var ctx = document.getElementById('myChart').getContext('2d');
var data = {
labels: ["data1", "data2", "data3", "data4", "data5", "data6"],
datasets: [{
label: "Sample data",
data: [128, 56, 47, 64, 125, 36],
borderColor: "rgba(0, 128, 0, 1)"
}]
};
var myLineChart = new Chart(ctx, {
type: "line",
data: data
});
console.log(myLineChart.boxes[0].chart.scales['y-axis-0'].ticks[myLineChart.boxes[0].chart.scales['y-axis-0'].ticks.length - 1])
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0"></script>
<canvas id="myChart" width="200" height="100"></canvas>
Source:stackexchange.com