infoWindow.setContent( JSON.stringify(mapsMouseEvent.latLng.toJSON(), null, 2) ); infoWindow.open(map); const data = JSON.stringify(mapsMouseEvent.latLng.toJSON(), null, 2); const obj = JSON.parse(data); console.log(obj); // display in textbox document.getElementById("latitude").value = obj['lat']; document.getElementById("longitude").value = obj['lng'];