I found similar questions but not found any good answer so I am posting it again and with more specific environment.
I am using Node.js + Express
to build REST APi for my React Native
app.
I am using pattern Router->Controller->Service->Database
and I am not sure if I am supposed to throw specific errors from my services.
Example:
- I am validating registration request.
- Field validations are hapenning inside Controller (I am using
ajv
JSON schema validator). - Now I need to validate if user/email already exists
Am I supposed to do this from controller by calling for example service.emailExists(data.email)
before calling service.createUser(data)
??
Or I can let database fall on CREATE
duplicate, return false
from service.createUser(data)
and inform user from controller that Email exists
. If I do so, I am not able to inform user if there is Unspecified error
inside service, because it will always return as Email exists
error, even something else happens.
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