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var ctx = document.getElementById('chart1');
var MONTHS = [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December",
];

var barChartData = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [
        {
            label: "Dataset 1",
            backgroundColor: 'rgba(255, 201, 14, 1)',
            borderColor: 'rgba(255, 201, 14, 1)',
            borderWidth: 1,
            data: [
                10,
                20,
                30,
                40,
                50
            ],
        },
        {
            label: "Dataset 2",
            backgroundColor: 'rgba(255, 201, 14, 1)',
            borderColor: 'rgba(255, 201, 14, 1)',
            borderWidth: 1,
            data: [
                -100,
                -200,
                -300,
                -400,
                -500
            ],
        },
    ],
};

new Chart(ctx, {
    type: "bar",
    data: barChartData,
    options: {
        responsive: true,
        legend: {
            position: "top",
        },
        title: {
            display: true,
            text: "Chart.js Bar Chart",
        },
        scales:{
            y: {
                ticks: {
                    callback: function(val){
                        return this.getLabelForValue(Math.abs(val));
                        // or: //return this.getLabelForValue(val).replace(/^-/, '');
                    },
                }
            }
        },
    },
});

<canvas id="chart1" style="height:500px"></canvas>

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/4.1.2/chart.umd.js"
        integrity="sha512-t41WshQCxr9T3SWH3DBZoDnAT9gfVLtQS+NKO60fdAwScoB37rXtdxT/oKe986G0BFnP4mtGzXxuYpHrMoMJLA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>