var _root_list = ds_list_create(); // list containing each wishlist created

var wishlist_size = ds_grid_height(wishlist_grid); // get the number of wishlists created
for(var i=0;i<wishlist_size;i++) // loop through every wishlist in the grid
    {
    // create submap that contains "wishlist" and "itemlist"
    var _submap = ds_map_create();

    // create map for the wishlist
    var _map_wish = ds_map_create();

    // get values
    var _name = wishlist_grid[# 0,i]; // wishlist name
    var _owner = wishlist_grid[# 1,i]; // owner id

    // add key/values to wishlist map
    ds_map_add(_map_wish ,"name",_name); // save wishlist name
    ds_map_add(_map_wish ,"owner",_owner); // save owner id of list

    // add wishlist map to the submap
    ds_map_add_map(_submap,"wishlist",_map_wish);

    // save every item in the item list
    var item_list = ds_list_create(); // contains the itemlist

    var item_grid = wishlist_grid[# 2,i]; // get the pointer of item grid associated with the wishlist
    var itemlist_size = ds_grid_height(item_grid); // number of items in the grid
    for(var n=0;n<itemlist_size;n++) // loop through the grid
        {
        // create the map for the item
        var _map_item = ds_map_create();
        ds_list_add(item_list,_map_item); // add the map to the item_list
        ds_list_mark_as_map(item_list,ds_list_size(item_list)-1); // mark it as a map

        // get values
        var _name = item_grid [# 0,n]; // item name
        var _price = item_grid [# 1,n]; // item price

        // add key/values to itemlist map
        ds_map_add(_map_item ,"name",_name); // save item name
        ds_map_add(_map_item ,"price",_price); // save item price
        }

    // add item_list to the submap
    ds_map_add_list(_submap,"itemlist",item_list); // added to submap

    ds_list_add(root_list,_submap); // add the submap to the root_list
    ds_list_mark_as_map(root_list,ds_list_size(root_list)-1); // mark as map
    }

// wrap the data up
var _wrapper = ds_map_create();
ds_map_add_list(_wrapper,"ROOT",_root_list);

// save as string
var _string = json_encode(_wrapper);