Chartjs-Chart js – set width to a specific bar

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Despite it’s not clearly documented, you can define barPercentage as an array of values.

barPercentage: [0.5, 0.5, 0.5, 0.5, 1, 0.5, 0.5],

Please have a look at the amended code from Chart.js bar documentation. 

new Chart(document.getElementById("chart"), {
  type: "bar",
  data: {
    labels: ["January", "February", "March", "April", "May", "June", "July"],
    datasets: [{
      label: "My First Dataset",
      data: [65, 59, 80, 81, 56, 55, 40],
      barPercentage: [0.5,0.5,0.5,0.5,1,0.5,0.5],
      categoryPercentage: 1,
      fill: false,
      backgroundColor: ["rgba(255, 99, 132, 0.2)", "rgba(255, 159, 64, 0.2)", "rgba(255, 205, 86, 0.2)", "rgba(75, 192, 192, 0.2)", "rgba(54, 162, 235, 0.2)", "rgba(153, 102, 255, 0.2)", "rgba(201, 203, 207, 0.2)"],
      borderColor: ["rgb(255, 99, 132)", "rgb(255, 159, 64)", "rgb(255, 205, 86)", "rgb(75, 192, 192)", "rgb(54, 162, 235)", "rgb(153, 102, 255)", "rgb(201, 203, 207)"],
      borderWidth: 1
    }]
  },
  options: {
    scales: {
      yAxes: [{
        ticks: {
          beginAtZero: true
        }
      }]
    }
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="chart" height="80"></canvas>

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