Project Structure
If you want to add a new route then you will goto /routes folder and add a new Router.
Then register that router in the index.ts file under the /routes folder.
Then you will create a Controller under the /controllers directory.All business logics should go into there.
Specific use cases should be handles by Service classes under the /service folder.
All Database related things should go under /repositories folder.
To create a new model for data base look into the /models folder.