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You will have to edit the color of the grid in the scale option like the example below
var options = {
type: 'radar',
data: {
labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
datasets: [{
label: '# of Votes',
data: [12, 19, 3, 5, 2, 3],
borderWidth: 1
}]
},
options: {
scales: {
r: {
grid: {
color: 'red'
}
}
}
}
}
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/3.0.2/chart.js" integrity="sha512-n8DscwKN6+Yjr7rI6mL+m9nS4uCEgIrKRFcP0EOkIvzOLUyQgOjWK15hRfoCJQZe0s6XrARyXjpvGFo1w9N3xg==" crossorigin="anonymous"></script>
</body>
Source:stackexchange.com