Simple markers

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<div id="map"></div>
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

CSS

/* Always set the map height explicitly to define the size of the div
 * element that contains the map. */
#map {
  height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

function initMap() {
  var myLatLng = {lat: 50.855108, lng: 4.2353004};

  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: myLatLng
  });
  
  markers.points.forEach(function(marker) {    
    var infoWindow = new google.maps.InfoWindow({
    	content: marker.address
    });
    var mark = new google.maps.Marker({
      position: marker.loc,
      map: map,
      title: marker.description
  	})
    mark.addListener('click', function() {
      infoWindow.open(map, mark);
    });
  });

}


var markers = '{"slug":"UBA secties","points":[{"searchTerm":"Stationstraat 71 9880 Aalter","address":"Stationsstraat 71, 9880 Aalter, België","description":"ALT - ON8ALT","markerColor":"default","markerType":"numeric","loc":{"lat":51.0875397,"lng":3.4482603000000154}},{"searchTerm":"Industrielaan 23B 9320 Erembodegem","address":"Industrielaan 23B, 9320 Aalst, België","description":"AST - ON7SA","markerColor":"default","markerType":"numeric","loc":{"lat":50.9124954,"lng":4.042724399999997}},{"searchTerm":"Berkenlaan 52 9800 Deinze","address":"Berkenlaan 52, 9800 Deinze, België","description":"DNZ - ON6UD","markerColor":"default","markerType":"numeric","loc":{"lat":50.967893,"lng":3.5298815999999533}},{"searchTerm":"Fabriekstraat 41 9200 Dendermonde","address":"Fabriekstraat 41, 9200 Dendermonde, België","description":"DRC - ON4ARC","markerColor":"default","markerType":"numeric","loc":{"lat":51.0293621,"lng":4.17917060000002}},{"searchTerm":"Ledestraat 42 9971 Lembeke","address":"Ledestraat 42, 9971 Kaprijke, België","description":"EKO - ON4EKO","markerColor":"default","markerType":"numeric","loc":{"lat":51.1828997,"lng":3.6364435000000412}},{"searchTerm":"Zandstraat 174 9900 Eeklo","address":"Zandstraat 174, 9900 Eeklo, België","description":"ERA - ON7ERA","markerColor":"default","markerType":"numeric","loc":{"lat":51.1787364,"lng":3.5612209999999322}},{"searchTerm":"Moenebroekstraat 84 9506 Schendelbeke","address":"Moenebroekstraat 84,...