Microservices Messenger

A chat application backend built with microservices architecture. The system uses a monorepo structure with TypeScript, Express.js, and MySQL.

Architecture

Structure

microServices/
├── packages/
│   └── common/              # Shared utilities
│       ├── logger.ts        # Pino-based logging
│       ├── env.ts           # Environment validation (Zod)
│       ├── errors/          # HTTP error classes
│       └── http/            # Request validation
│
└── services/
    └── auth-service/        # Authentication service
        ├── config/          # Environment configuration
        ├── db/              # Sequelize ORM setup
        ├── middleware/      # Error handling
        ├── routes/          # API endpoints
        └── utils/           # Service utilities

Request Flow

Client Request
    │
    ├── Security Headers (Helmet)
    ├── Cross-Origin Control (CORS)
    ├── Body Parsing (JSON)
    ├── Route Handler
    └── Error Handler
    │
Response

Services

Auth Service

Handles user authentication and registration.

• Port: 6000
• Database: MySQL 8.0
• ORM: Sequelize
• Security: Helmet, CORS
• Error handling: Centralized middleware

Tech Stack

• Runtime: Node.js + TypeScript
• Framework: Express.js v5.2.1
• Database: MySQL 8.0 (Docker)
• ORM: Sequelize v6.37.7
• Validation: Zod
• Logging: Pino
• Package Manager: pnpm (workspaces)
• Development: tsx, ESLint, Prettier

Available Scripts

• pnpm dev - Start all services in development mode
• pnpm build - Build all services
• pnpm lint - Run ESLint across all packages
• pnpm format - Check code formatting with Prettier

Author

Shivam Karna

• GitHub: @ShivamKarna

License

ISC License