What is the best way to design caching on nodejs?

Question

Node.js

There is a project on nodejs\express, 3 layers:
1) database
2) business
3) controller

Questions:
1) In which layer should I embed check / return / cache invalidation?
2) Invalidation \ check \ return of the cache is smeared one by one \ by two \ by all layers - is this the norm?
For example, validation\return is built into the controller, and invalidation is built into the business logic\dal
3) If not the norm, then how to implement caching with minimal coupling?

Answer 1

The cache is embedded in the place where it is needed. It all depends on what kind of data you have. But it's still better to keep it in controllers so that less code is called. However, if you have simple controllers, then it makes sense to transfer to bl. In dbl it is worth taking out if you have an old-school application where many checks are made on storage