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HTML

<script src="https://cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>

JavaScript

function getCornerPts(turfInputPolygon, threshold) {

	var threshold = threshold || 1;
  
  var rightAngles = 0;
  var sumAngles = 0;
  
  var cornerPts = [];
  
  var turfPolygon = turfInputPolygon;
  
  if (turf.booleanClockwise(turf.polygonToLine(turfPolygon).features[0])) {
  
  	turfPolygon = turf.rewind(turfPolygon);
    
  };
  
  var turfPolygonPts = turf.explode(turfPolygon);

	turfPolygonPts.features.push(turfPolygonPts.features[1]);

  for (var i = 1, len = turfPolygonPts.features.length; i < len - 1; i++) {

    var b1 = turf.bearing(turfPolygonPts.features[i - 1], turfPolygonPts.features[i]);
    var b2 = turf.bearing(turfPolygonPts.features[i], turfPolygonPts.features[i + 1]);

    var angle = Math.min((b1 - b2 + 360) % 360, (b2 - b1 + 360) % 360);
    
    sumAngles += angle;

    if ((90 - threshold) <= angle && angle <= (90 + threshold)) {
    	
      rightAngles ++;
      
      cornerPts.push(turfPolygonPts.features[i]);
      
    };

  };
  
  return (rightAngles == 4 && ((360 - threshold) <= sumAngles && sumAngles <= (360 + threshold))) ? cornerPts : false;

};

var geojson = {
	"type": "FeatureCollection",
	"features": [{
			"type": "Feature",
			"properties": {},
			"geometry": {
				"type": "MultiPolygon",
				"coordinates": [
					[
						[
							[
								-102.59602204999999,
								32.36491866700004
							],
							[
								-102.59952111499996,
								32.37500140000003
							],
							[
								-102.60087906199999,
								32.378914276000046
							],
							[
								-102.58443896599994,
								32.38292495700006
							],
							[
								-102.58184811899997,
								32.37500015000006
							],
							[
								-102.57980711899995,
								32.36875659300006
							],
							[
								-102.59602204999999,
								32.36491866700004
							]
						]
					]
				]
			}
		}
	]
};

var arrMultiPolygon = geojson.features[0].geometry.coordinates;
var multiPolygon = turf.multiPolygon(arrMultiPolygon);

alert("check the console...