points = [
  [21, 20.23],
  [21, 20.23],
  [23, 22.77],
  [25, 25.11],
  [27, 27.26],
  [28, 28.28]
];

points = Array.from(
  new Set(
    reg.points.map(function (value) {
      return JSON.stringify(value);
    })
  )
)
.map(function (value) {
  return JSON.parse(value);
})