Initial Version

server/middlewares/helpers/geoDistance.js

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+module.exports = (lon1, lat1, lon2, lat2) => {
+  // mean radius of earth's = 6,371km
+  const R = 6371;
+  // distance between latitude and longitude in radians
+  const dLat = ((lat2 - lat1) * Math.PI) / 180;
+  const dLon = ((lon2 - lon1) * Math.PI) / 180;
+  // haversine’ formula to calculate distance
+  const a =
+    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+    Math.cos((lat1 * Math.PI) / 180) *
+      Math.cos((lat2 * Math.PI) / 180) *
+      Math.sin(dLon / 2) *
+      Math.sin(dLon / 2);
+  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+  const d = R * c;
+  // if (d > 1) return Math.round(d) + "km";
+  // else if (d <= 1) return Math.round(d * 1000) + "m";
+  return d;
+};