myex-cli/docs/folder-structure.md

Opinionated Express.js framework with CLI tools

# Project Folder Structure

This document outlines the purpose and contents of each folder in the project.

## Root Structure

```
/project-root
├── /src                  # Source code
├── /deploy               # Containerization and orchestration files
├── /test                 # Automated tests
├── /docs                 # Project documentation
├── .env                  # Environment variable configurations
├── package.json          # Project dependencies and scripts
└── pm2.config.js         # PM2 ecosystem configuration
```

## Source Code (`/src`)

```
/src
├── /config          # Environment configurations, passport strategies, DB settings
├── /controllers     # Handle incoming HTTP requests and responses
├── /middlewares     # Custom middleware for authentication, logging, error handling
├── /models          # MongoDB schema definitions (using Mongoose)
├── /routes          # Express route definitions mapped to controllers
├── /security        # Security configurations (Helmet, CORS, and related settings)
├── /services        # Business logic that interacts with models and external APIs
├── /db              # Database connection and initialization logic
├── /utils           # Utility modules (e.g., logger setup with Winston)
└── app.js           # Main Express app setup and middleware registration
```

### Key Components in `/src`:

- **config**: Contains environment-specific configurations, authentication strategies, and database settings.
- **controllers**: Contains logic for handling HTTP requests, validating inputs, and sending responses.
- **middlewares**: Contains custom Express middleware for authentication, request logging, error handling, etc.
- **models**: Contains Mongoose schema definitions for MongoDB documents.
- **routes**: Contains Express route definitions that map URLs to controller functions.
- **security**: Contains security-related configurations like Helmet (HTTP headers) and CORS.
- **services**: Contains business logic that interacts with models and external APIs.
- **db**: Contains database connection and initialization logic.
- **utils**: Contains utility functions and modules like the logger setup.
- **app.js**: Main application entry point that initializes Express and configures middleware.

## Deployment (`/deploy`)

```
/deploy
├── Dockerfile             # Docker image configuration
├── docker-compose.yml     # Multi-container configuration
└── /k8s                   # Kubernetes manifests
    ├── deployment.yaml    # Kubernetes Deployment configuration
    ├── service.yaml       # Kubernetes Service configuration
    ├── ingress.yaml       # Kubernetes Ingress configuration
    └── mongodb.yaml       # MongoDB StatefulSet configuration
```

The `/deploy` folder contains all files related to containerization and deployment:

- **Dockerfile**: Defines how to build the Docker image for the application.
- **docker-compose.yml**: Defines multi-container setup for local development or simple deployments.
- **k8s**: Contains Kubernetes manifests for orchestrated deployment:
  - **deployment.yaml**: Defines how the application should be deployed in Kubernetes.
  - **service.yaml**: Defines how the application is exposed within the Kubernetes cluster.
  - **ingress.yaml**: Defines how the application is exposed outside the Kubernetes cluster.
  - **mongodb.yaml**: Defines the MongoDB deployment as a StatefulSet in Kubernetes.

## Tests (`/test`)

```
/test
├── /unit          # Unit tests for individual functions and modules
├── /integration   # Integration tests for API endpoints and database interactions
└── /e2e           # End-to-end tests simulating real user scenarios
```

The `/test` folder contains automated tests for various parts of the application:

- **unit**: Contains tests for individual functions, modules, and components.
- **integration**: Contains tests for API endpoints and database interactions.
- **e2e**: Contains end-to-end tests that simulate real user scenarios.

## Documentation (`/docs`)

```
/docs
├── folder-structure.md      # Explains the project's folder structure
├── application-flow.md      # Documents the request handling process
├── prd.md                   # Product Requirements Document
└── tech-stack.md            # Describes the technologies used in the project
```

The `/docs` folder contains project documentation:

- **folder-structure.md**: This document, explaining the project's folder structure.
- **application-flow.md**: Documents the request handling process from entry to response.
- **prd.md**: Product Requirements Document defining the project's purpose, features, and requirements.
- **tech-stack.md**: Documents the technologies used in the project.