# Project Structure Patterns

### Domain-Based Folder Structure (Modular or Feature-Based Structure)

This approach organizes your project by **feature** or **module**. Each feature (like Authentication or Homepage) contains its own model, services, and UI components. This structure focuses on separating functionality by feature, grouping all related files for a feature together.

**Example**

```plaintext
Authentication/
  - model.js
  - services.js
  - UI.js
Homepage/
  - model.js
  - services.js
  - UI.js
```

**Benefits**:

* * Easier to navigate and reason about the code related to a specific feature.
        
    * Promotes encapsulation, so all logic related to a feature is grouped together.
        
    * Easier to scale in large applications.
        
        **When to Use**:
        
    * This structure works well in applications with many features, making it easier to manage and maintain the code as the project grows.
        

### **Layered (or Vertical) Folder Structure**

This structure organizes the project by **layer** or **type of responsibility** (e.g., models, services, UI). Each layer holds all the models, services, or UI components for the entire application, grouped together by their role.

```plaintext
model/
  - AuthenticationModel.js
  - HomepageModel.js
services/
  - AuthenticationServices.js
  - HomepageServices.js
UI/
  - AuthenticationUI.js
  - HomepageUI.js
```

**Benefits**:

* * Clearly separates the concerns of different layers (e.g., data, business logic, UI).
        
    * Easier to share common logic (e.g., services or models) across multiple features.
        
    * Standardizes where different types of logic reside.
        
    
    **When to Use**:
    
* This structure is often better for applications where there is significant overlap between business logic or UI components across different features.
    

### Comparison:

* **Domain-Based (Modular) Structure**:
    
    * Great for teams working on different features independently.
        
    * Each module is more self-contained.
        
    * Easier to onboard developers working on specific features.
        
* **Layered Structure**:
    
    * Ideal for codebases where the logic for models, services, and UI are highly shared or reused across features.
        
    * Maintains a clear separation of concerns across different layers.
        

### Hybrid Approach

Many projects use a hybrid approach, combining both strategies:

**Top-level features**, with each feature having a **separation of concerns** inside (e.g., services, UI, model), but at a higher level, the feature is self-contained.

```plaintext
src/
  Authentication/
    - model/
    - services/
    - UI/
  Homepage/
    - model/
    - services/
    - UI/
```

This structure keeps the **benefits of modularity** while ensuring clear separation of responsibilities within each module.