blessing-skin-server/app/Http/Controllers/Controller.php

<?php

namespace App\Http\Controllers;

use Illuminate\Validation\Validator;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;

class Controller extends BaseController
{
    use DispatchesJobs, ValidatesRequests;

    /**
     * {@inheritdoc}
     */
    protected function formatValidationErrors(Validator $validator)
    {
        return [
            'errno' => 1,
            'msg' => $validator->errors()->first()
        ];
    }
}