[Chartjs]-Chartjs – change tooltip border radius

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This can be achieved by setting cornerRadius property to 0 (or any number) for tooltips in your chart options.

options: {
   tooltips: {
      cornerRadius: 0
   },
   ...
}

working example

var ctx = $('#myChart');
var myChart = new Chart(ctx, {
   type: 'horizontalBar',
   data: {
      labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
      datasets: [{
         label: '# of Votes',
         data: [12, 19, 3, 5, 2, 3],
         backgroundColor: [
            'rgba(255, 99, 132, 0.2)',
            'rgba(54, 162, 235, 0.2)',
            'rgba(255, 206, 86, 0.2)',
            'rgba(75, 192, 192, 0.2)',
            'rgba(153, 102, 255, 0.2)',
            'rgba(255, 159, 64, 0.2)'
         ],
         borderColor: [
            'rgba(255,99,132,1)',
            'rgba(54, 162, 235, 1)',
            'rgba(255, 206, 86, 1)',
            'rgba(75, 192, 192, 1)',
            'rgba(153, 102, 255, 1)',
            'rgba(255, 159, 64, 1)'
         ],
         borderWidth: 1
      }]
   },
   options: {
      tooltips: {
         cornerRadius: 0 //<- set this
      },
      scales: {
         xAxes: [{
            ticks: {
               beginAtZero: true
            }
         }]
      }
   }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<canvas id="myChart"></canvas>

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