ChartJS Line Charts – remove color underneath lines

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Check this section on the Chart.js docs. Set the fill property to false within your dataset configuration:

var data = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
        label: "My First dataset",
        fill: false,
        data: [1, 2, 3]
    }]
};

Specify an array to the borderColor property if you want each line to have a different stroke color:

var myColors = ['red', 'green', 'blue']; // Define your colors

var data = {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
        label: "My First dataset",
        fill: false,
        borderColor: myColors
        data: [1, 2, 3]
    }]
};

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