spa-js-api/app/Http/Requests/ApiRequest.php

<?php

namespace App\Http\Requests;

use App\Exceptions\ApiException;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Foundation\Http\FormRequest;


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

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            //
        ];
    }

    protected function failedValidation(Validator $validator)
    {
        throw new ApiException(422, "Validation error", $validator->errors());
    }

}