Format errors as JSON after validation

I'm trying to use Laravel validation to generate custom error message, however I'm unable to find the function I should be overriding.

Route: POST:/entries/ uses EntryController@store which uses EntryStoreRequest to perform validation.

EntryStoreRequest

namespace App\Api\V1\Requests;

class EntryStoreRequest extends ApiRequest
{
    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'message' => [
                'string',
                'required',
                'max:65535',
            ],
            'code' => [
                'string',
                'max:255',
                'nullable'
            ],
            'file' => [
                'string',
                'max:255',
                'nullable'
            ],
            'line' => [
                'string',
                'max:255',
                'nullable'
            ],
            'stack' => [
                'string',
                'max:65535',
                'nullable'
            ]
        ];
    }
}

ApiRequest

namespace App\Api\V1\Requests;

use Illuminate\Foundation\Http\FormRequest;

abstract class ApiRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }
}

The errors are currently returned as:

{
    "message": "The given data was invalid.",
    "errors": {
        "message": [
            "The message field is required."
        ]
    }
}

I want to format them as:

{
    "data": [],
    "meta: {
        "message": "The given data was invalid.",
        "errors": {
            "message": [
                "The message field is required."
            ]
        }
}

How can I achieve this within the ApiRequest class?

via Chebli Mohamed