Remove the vertical line in the chart js line chart

The following applies to Chart.js 2.*.

If you only have one x-axis, whether the vertical grid lines (that are related to this x-axis) are displayed or not, is specified by the boolean value of options.scales.xAxes[0].gridLines.display. To be more precise, the following chart options disable the display of vertical grid lines for the single x-axis case.

options : {
    scales : {
        xAxes : [ {
            gridLines : {
                display : false
            }
        } ]
    }
}