Removing legend on charts with chart.js v2

From chart.js version 2.x backwards:

The options object can be added to the chart when the new Chart object is created.

var chart1 = new Chart(canvas, {
    type: "pie",
    data: data,
    options: {
         legend: {
            display: false
         },
         tooltips: {
            enabled: false
         }
    }
});

From chart.js version 3.x onwards:

legend, title and tooltip namespaces are moved from options to options.plugins.

var chart1 = new Chart(canvas, {
    type: "pie",
    data: data,
    options: {
        plugins: {
            legend: {
                display: false
            },
        }
    }
});