.
├── api                        # API endpoints
|   ├── some-endpoint
|   |   |   ├── controller.ts  # Calls the service methods and handles responses
|   |   |   ├── router.ts      # Sets up the router and all the available routes
|   |   |   └── service.ts     # Handles the more granular parts; DB actions, remote requests etc.
|   │   └── ...
├── constants                  # Constants to use throughout the service
│   └── ...
├── errors                     # Error classes and helpers
│   └── ...
├── middlewares                # Custom Express middlewares
│   └── ...
├── models                     # ORM-odels
│   └── ...
├── modules                    # Modules are used to separate code to make it more testable
|   ├── some-module
|   |   ├── doesSomethingCool.ts
|   |   ├── index.ts
|   │   └── ...
│   └── ...
├── types                      # TypeScript types & interfaces
│   └── ...
├── utils                      # Utility functions
│   └── ...
├── index.ts                   # Entrypoint - starts the server
└── server.ts                  # This is where the Express app is setup and configured