first commit of v.02 application

LLM_DEV_PROMPTS/NODEJS PROJECTS/NODE_BACKEND_ARCH_BASICS.md

@@ -0,0 +1,30 @@
+---
+title: Node Backend Architectural Basic Principals
+last_modified: 2026-03-02
+---
+
+1. Separate concerns  into distinct layers. 
+
+2. Adhering to the above pricinciple makes c ode more extensible, testable and maintainable. Group around functionality, adhering to the following structure on the backend:
+
+ a. **Routes/Controllers:** Handle API endpoints and process the request/response cycle. Controllers should be kept lean, delegating business logic to the service layer.
+
+ b. **Services/Business Logic:** Contain the core application logic and domain rules. This layer orchestrates interactions between other components.
+
+ c.  **Models/Data Access:** Interact with the database (using ORMs like Mongoose or Sequelize). Abstract database logic into repositories for reusability.
+
+ d. **Middleware:** Used for cross-cutting concerns such as cors, authentication, logging, and error handling.
+
+3. Modularity: Break code into the smallest reusable modules that make logical sense.  Each discreet class or method should have a single responsibility.
+
+4. Objects should depend on abstractions, not concretions. High-level modules contain the core business logic or application-specific behavior.
+Lower-level modules deal with implementation details, such as interacting with a database, file system, or external APIs.
+
+# Author
+
+[@sjDev](https://sjdev.co)
+<[sj@sjdev.co](mailto:sj@sjdev.co)>
+
+# License
+
+MIT. See [LICENSE](../LICENSE).