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By default, when a data object is transformed into JSON in your controller, it looks like this: 
{
    "name": "Never gonna give you up",
    "artist": "Rick Astley"
}
You can wrap a data object: 
SongData::from(Song::first())->wrap('data');
Now the JSON looks like this: 
{
    "data": {
        "name": "Never gonna give you up",
        "artist": "Rick Astley"
    }
}
Data objects and collections will only get wrapped when sending them as a response, never when calling toArray or toJson.

​
Default Wrap Key

Define a default wrap key inside a data object: 
class SongData extends Data
{
    public function defaultWrap(): string
    {
        return 'data';
    }

    // ...
}

​
Global Wrap Key

Set a global wrap key in config/data.php: 
/*
 * Data objects can be wrapped into a key like 'data' when used as a resource,
 * this key can be set globally here for all data objects. You can pass in
 * `null` if you want to disable wrapping.
 */
'wrap' => 'data',

​
Wrapping Collections

Collections can be wrapped just like data objects: 
SongData::collect(Song::all(), DataCollection::class)->wrap('data');
For now, wrapping is only supported for DataCollections, PaginatedDataCollections, and CursorPaginatedDataCollections on the root level. Laravel Collections and arrays cannot be wrapped (yet), though nested properties with such types can be wrapped.
The JSON output: 
{
    "data": [
        {
            "name": "Never Gonna Give You Up",
            "artist": "Rick Astley"
        },
        {
            "name": "Giving Up on Love",
            "artist": "Rick Astley"
        }
    ]
}

​
Paginated Collections

Set the data key in paginated collections: 
SongData::collect(Song::paginate(), PaginatedDataCollection::class)->wrap('paginated_data');
JSON output: 
{
    "paginated_data": [
        {
            "name": "Never Gonna Give You Up",
            "artist": "Rick Astley"
        },
        {
            "name": "Giving Up on Love",
            "artist": "Rick Astley"
        }
    ],
    "meta": {
        "current_page": 1,
        "first_page_url": "https://spatie.be/?page=1",
        "from": 1,
        "last_page": 7,
        "last_page_url": "https://spatie.be/?page=7",
        "next_page_url": "https://spatie.be/?page=2",
        "path": "https://spatie.be/",
        "per_page": 15,
        "prev_page_url": null,
        "to": 15,
        "total": 100
    }
}

​
Nested Wrapping

A data object included inside another data object will never be wrapped even if a wrap is set: 
class UserData extends Data
{
    public function __construct(
        public string $title,
        public string $email,
        public SongData $favorite_song,
    ) {
    }
    
    public static function fromModel(User $user): self
    {
        return new self(
            $user->title,
            $user->email,
            SongData::create($user->favorite_song)->wrap('data')
        );
    }
}

UserData::from(User::first())->wrap('data');
JSON output: 
{
    "data": {
        "name": "Ruben",
        "email": "ruben@spatie.be",
        "favorite_song": {
            "name": "Never Gonna Give You Up",
            "artist": "Rick Astley"
        }
    }
}

​
Data Collections Inside Data Objects

A data collection inside a data object will get wrapped when a wrapping key is set (mimicking Laravel resources): 
use Spatie\LaravelData\Attributes\DataCollectionOf;
use Spatie\LaravelData\DataCollection;

class AlbumData extends Data
{
    public function __construct(
        public string $title,
        #[DataCollectionOf(SongData::class)]
        public DataCollection $songs,
    ) {
    }

    public static function fromModel(Album $album): self
    {
        return new self(
            $album->title,
            SongData::collect($album->songs, DataCollection::class)->wrap('data')
        );
    }
}

AlbumData::from(Album::first())->wrap('data');
JSON output: 
{
    "data": {
        "title": "Whenever You Need Somebody",
        "songs": {
            "data": [
                {
                    "name": "Never Gonna Give You Up",
                    "artist": "Rick Astley"
                },
                {
                    "name": "Giving Up on Love",
                    "artist": "Rick Astley"
                }
            ]
        }
    }
}

​
Disabling Wrapping

When a data object is wrapped due to the default wrap method or a global wrap key, you can disable wrapping: 
SongData::from(Song::first())->withoutWrapping();

​
Getting a Wrapped Array

By default, toArray and toJson never wrap a data object or collection. Get a wrapped array manually: 
use Spatie\LaravelData\Support\Wrapping\WrapExecutionType;

SongData::from(Song::first())->wrap('data')->transform(wrapExecutionType: WrapExecutionType::Enabled);