Try wrapping your array in json_encode()
:
function add_map_data() {
$objName = "MapData";
$array = array(
"MapViewLatitude" => "51.505",
"MapViewLongitude" => "-0.09",
);
wp_enqueue_script( 'mapdata', get_bloginfo('template_url').'/custom/map.js', null, null, false );
wp_localize_script( 'mapdata', $objName, array('my_arr' =>json_encode($array)));
}
add_action( 'wp_enqueue_scripts', 'add_map_data');
Next step is to parse the JSON string back to a JSON object in JavaScript so:
//first escape the string then parse this string and convert it into a JSON object
var MapDataJSON = jQuery.parseJSON(MapData.my_arr.replace(/"/g, '"'));
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