$.getJSON(
    "https://XXXXX.json",
    function(data) {
      data.data1.forEach(function(datas1) {
        var var1 = new google.maps.LatLng(
          datas1.marker_coordinates[0],
          datas1.marker_coordinates[1]
        );

        var var2 = new google.maps.Marker({
          position: var1,
          map: map,
          icon: icon
        });

        var InfoCardContent =
          "<h3>" +
          datas1.test +
          " - " +
          datas1.test2 +
          '</h3><h4 style="margin-top:-10px;">Streets: </h4>' +
          datas1.test3;

        var InfoWindow = new google.maps.InfoWindow({
          content: InfoCardContent
        });

        var2.addListener("click", function() {
          InfoWindow.close();
          InfoWindow.open(map, var2);
        });
      });
    }
  );