Organized code is productive code. By separating your app into layers, you make it easier to test and evolve.
1The Controller (Traffic Cop)
The Controller is the first point of contact after the router. Its only job is to extract data from the request, call a Service, and return a response. Keep it 'thin'!
2The Service (The Brain)
Services are independent of HTTP. You could theoretically call a Service from a CLI, a cron job, or an Express route. This reusability is what makes layered architecture so powerful.
3The Model (The Blueprint)
Models act as the single source of truth for your data. By encapsulating database logic here, you can change your database engine later without rewriting your entire application logic.
