I took a quick look and maybe a couple suggestions.

I do not generally do this but it is something that I should and is a good suggestion. Coding style, take a look at how Laravel maintains readable code. Simple example, https://github.com/laravel/laravel/blob/master/app/Providers/AuthServiceProvider.php they have spacing, doc blocks, etc - that make the code all very readable and provides some documentation at the same time.

Maybe changing these functions to use the config/default message instead of a hard-coded function default, might be something to look at.

https://github.com/Anshdesire/ApiResponse/blob/master/src/ApiResponse.php#L148

    public function respondNotFound($message = "Resource not found!")
    {
        return $this->setStatusCode($this->STATUS_CODE[404])->respondWithError($message);
    }
    public function respondInternalError($message = "Internal server error")
    {
        return $this->setStatusCode($this->STATUS_CODE[500])->respond([],$message,[]);
    }

I did not see anything else in my quick look, but i do see how the package will be useful. I might end up using this in a project later, so that I do not have to reinvent the wheel.

Hope that helps :)

Thank you so much porter and you can point right there also :) I have followed all your points and will release it soon.

:)