How can I validate array of objects using FormRequest in Laravel 5.8?

I'm making a restfull api in Laravel 5.8 and using Postman to send my request. I would like to validate a request like this from postman:

{
    "details": [
        {
            "quantity": "2",
            "sub_total": "120000",
            "order_id": "1",
            "product_id": "3"
        },
        {
            "quantity": "1",
            "sub_total": "120000",
            "order_id": "1",
            "product_id": "2"
        }
    ]
}

Currently, i'm using a form request to validate, let say this is my Form Request App\Http\Requests\OrderDetailRequest

 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Contracts\Validation\Validator;
 use Illuminate\Http\Exceptions\HttpResponseException;

 public function rules()
 {
    return [
         'details.*.quantity' => 'required',
         'details.*.sub_total' => 'required',
         'details.*.order_id' => 'required',
         'details.*.product_id' => 'required',          
    ];
 }

 public function messages()
 {
    return [
         'details.*.quantity.required' => 'Quantity is required',
         'details.*.sub_total.required' => 'Sub Total is required',
         'details.*.order_id.required' => 'Order Id is required',
         'details.*.product_id.required' => 'Product is required',  
    ];
 }

protected function failedValidation(Validator $validator)
{
    throw new HttpResponseException(response()->json($validator->errors(), 422));
}

I have read few article saying that using a FormRequest is the best practice to validate a request, instead of putting validation in the controller.

So my case is: When i try to validate (e.g leave quantity value as null), i got no error message. it just gave me [] an empty array

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