Illuminate\Database\Eloquent\Model::toJson PHP Method

    public function toJson($options = 0)
    {
        $json = json_encode($this->jsonSerialize(), $options);
        if (JSON_ERROR_NONE !== json_last_error()) {
            throw JsonEncodingException::forModel($this, json_last_error_msg());
        }
        return $json;
    }

 public function toJson($options = 0)
 {
     return parent::toJson($options);
 }