JSFiddle - React, Tailwind, and code Playground

HTML

<div id="res">

</div>

JavaScript

var arr = [
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, -2, 0, 0],
  [0, -2, 0, 0],
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, -2, 0, 0],
  [0, -2, 0, 0],
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, 0, 0, -2],
  [0, 0, -2, 0],
  [0, -2, 0, 0],
  [0, -2, 0, 0],
  [-2, 0, 0, 0],
  [-2, 0, 0, 0],
  [-2, 0, 0, 0],
  [-2, 0, 0, 0],
  [-2, 0, 0, 0],
  [-2, 0, 0, 0]
];
var _tmp_arr = [];
var result = [];
$.each(arr, function(i,v)
       {
  if(!_tmp_arr.includes(JSON.stringify(v)))
  {
    _tmp_arr.push(JSON.stringify(v));
  }
});

$.each(_tmp_arr, function(i,v)
       {
  result.push(JSON.parse(v));
});

document.getElementById("res").innerHTML = JSON.stringify(result);