[Chartjs]-Circular grid radar and scale max/min not working – chartjs

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You are mixing V2 and V3 syntax in all the wrong ways, in V2 you need to use the scale option not scales.r and the min/max have to be configured in the ticks part not in the root and grid must be gridLines:

var options = {
  type: 'radar',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        borderColor: 'pink'
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        borderColor: 'orange'
      }
    ]
  },
  options: {
    scale: {
      ticks: {
        max: 40,
        min: 0
      },
      gridLines: {
        circular: true
      }
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.js"></script>
</body>

For more info you can read the 2.9.4 documentation

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