Although the bulk of the validation logic has been abstracted into a separate module, the request handler is still processing the results of the validator, interacting with the database, and sending back the response; it still does not comply with the single responsibility principle.
The request handler's only job should be to pass the request to an engine, which will process the request, and respond with the result of the operation. Based on the result of the operation, the request handler should then issue an appropriate response to the client.
So, let's create a new directory at src/engines/users and add a create.js file; inside, define a create function and export it. This create function will validate our request and ...
