NodeJS Project Generator

A CLI tool to generate a Node.js project with a custom architecture using Express and Prisma. The generated project follows domain-driven design (DDD) principles and Clean Architecture patterns, ensuring maintainability, scalability, and testability.

Features

• Custom Architecture: Generates a project structure based on domain-driven design (DDD) and Clean Architecture principles.
• Express Integration: Pre-configured with Express for building web applications.
• Prisma ORM: Integrates Prisma as an ORM for database interactions.
• Essential Middleware: Includes essential middleware like Helmet for security and Winston for logging.
• Error Handling: Provides centralized error handling.
• Environment Configuration: Manages environment variables using dotenv.
• Testing Setup: Sets up unit, integration, and end-to-end testing directories.
• Code Quality Tools: Includes ESLint and Prettier for code quality and consistent formatting.

Project Structure

The generated project follows this directory structure:

my-app/
├── src/
│   ├── application/                    //Handles business logic orchestration.
│   │   ├── services/
│   │   └── useCases/
│   ├── domain/                         //Contains core business logic and concepts.
│   │   ├── entities/
│   │   ├── repositories/
│   │   └── valueObjects/
│   ├── infrastructure/                 //Manages external dependencies and implementations of interfaces defined in other layers.
│   │   ├── config/
│   │   ├── database/
│   │   │   └── prismaClient.js
│   │   ├── http/
│   │   ├── logging/
│   │   │   └── logger.js
│   │   └── repositories/
│   ├── interfaces/                    //Defines how the outside world interacts with your application.
│   │   ├── controllers/
│   │   ├── dtos/
│   │   ├── middleware/
│   │   │   └── errorHandler.js
│   │   ├── routes/
│   │   │   └── index.js
│   │   └── validators/
│   └── utils/                         //Utility functions and classes.
│       ├── errors/
│       │   └── AppError.js
│       └── helpers/
├── tests/                             //The project includes directories for unit, integration, and end-to-end tests.
│   ├── unit/
│   ├── integration/
│   └── e2e/
├── .env
├── .env.example
├── .eslintrc.js
├── .prettierrc
├── package.json
├── README.md
└── index.js

Getting Started

Prerequisites

• Node.js >= 20.X
• npm or yarn or pnpm

Installation

1. install the generator globally

   npm install -g nodearchgen

2. Generate a new project

   npx nodearchgen

3. follow the prompt to enter the project name and description

Next Steps

after generating the project, follow these steps to set it up:

1. Navigate to the project directory

   cd <project-name>

2. Navigate to the project directory

   npm install

3. Generate Prisma Client

   after modifing the schema.prisma file and DATA_BASE_URL use this command

   npx prisma generate

4. Start the server

   npm start

   Alternatively, for development purposes, you can use:

   npm run dev

Running Migrations

to apply migrations to your database run :

npx prisma migrate dev --name init

Using Prisma Studio

npx prisma studio

Project Architecture

Domain Layer

Contains core business logic and concepts.

• Entities: Represents core business objects and their behavior.
• Repositories: Interfaces for data access.
• Value Objects: Immutable objects representing values or concepts within the domain.

Application Layer

Handles business logic orchestration.

• Services: Business services that coordinate domain logic and infrastructure concerns.
• Use Cases: Specific workflows supported by the application.

Infrastructure Layer

Manages external dependencies and implementations of interfaces defined in other layers.

• Config: Configuration files for various environments.
• Database: Database connection setup, migrations, etc.
• HTTP: HTTP clients or utilities.
• Logging: Logging utilities.
• Repositories: Implementations of repository interfaces defined in the domain layer.

Interfaces Layer

Defines how the outside world interacts with your application.

• Controllers: Handle incoming HTTP requests, delegate work to the application layer, and return responses.
• DTOs: Data Transfer Objects used to transfer data between layers.
• Middleware: Centralized middleware such as authentication, authorization, and error handling.
• Routes: Define routing logic for API endpoints.
• Validators: Validation logic for incoming requests.

Utilities Layer

Utility functions and classes.

• Errors: Custom error classes for better error handling.
• Helpers: General-purpose helper functions.

Testing

The project includes directories for unit, integration, and end-to-end tests. You can add your test cases in these directories:

• tests/unit/
• tests/integration/
• tests/e2e/

Code Quality

The project includes ESLint and Prettier for maintaining code quality and consistent formatting.

• ESLint: Lints your JavaScript code.
• Prettier: Formats your code according to predefined rules.

Contributing

Contributions are welcome! Please follow these steps:

1. Fork the repository.
2. Create a new branch (git checkout -b feature/YourFeature).
3. Commit your changes (git commit -am 'Add some feature').
4. Push to the branch (git push origin feature/YourFeature).
5. Create a new Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Troubleshooting

Common Issues

Prisma Client Not Initialized

if you encounter the following error:

@prisma/client did not initialize yet. Please run "prisma generate" and try to import it again.

Run the following command to generate the Prisma client:

npx prisma generate

Missing .env File

Ensure that the .env file exists and contains the correct database connection string. Update the .env file with the appropriate credentials.

Example .envcontent:

DATABASE_URL=postgresql://user:password@localhost:5432/mydb

Support

if you have any questions or need assistance, feel free to open an issue on Github.