{
  "message": "422 Unprocessable Entity",
  "errors": {
    "mobile": [
      "手机号格式不正确"
    ]
  },
  "status_code": 422
}

// 将所有的 Exception 全部交给 App\Exceptions\Handler 来处理
app('api.exception')->register(function (Exception $exception) {
  $request = Illuminate\Http\Request::capture();
  return app('App\Exceptions\Handler')->render($request, $exception);
}); 

$class = get_class($exception);
switch ($class) {
  case 'Dingo\Api\Exception\ValidationHttpException':
    if ($request->expectsJson())
      return $this->errorRespond($exception->getErrors()->first(), $exception->getStatusCode());
    break;

  default:
    if ($request->expectsJson())
      return $this->errorRespond('系统休息了', 500000);

    break;
}

{
  "response_status_code": 422,
  "response_message": "请填写手机号",
  "data": []
}