TTN Gateways near my lat/lon location (and distance)

nearbyGateways.js

console.clear();

nearbyGateways(52.4, 4.87);  // latitude, longitude

function nearbyGateways(lat, lon, meters = 15000) {
    fetch(`https://www.thethingsnetwork.org/gateway-data/location?latitude=${lat}&longitude=${lon}&distance=${meters}`)
        .then(response => response.json())
        .then(json => {
            let $_Distance = (lat1, lon1, lat2, lon2, accuracy = 1e3) => {  // Haversine distance
                let M = Math, C = M.cos, P = M.PI / 180,
                    a = 0.5 - C((lat2 - lat1) * P) / 2 + C(lat1 * P) * C(lat2 * P) * (1 - C((lon2 - lon1) * P)) / 2;
                return M.round(M.asin(M.sqrt(a)) * 12742 * accuracy) / accuracy;// 12742 = Earth radius KMs * 2
            };
            console.table(Object.keys(json).map(id => {
                let gtw = json[id];
                gtw.distance = $_Distance(lat, lon, gtw.lat = gtw.location.latitude, gtw.lon = gtw.location.longitude);
                return gtw;
            }), ["id", "owner", "description", "last_seen", "lat", "lon", "distance"]);
        });
}