Microservices Backend for Android E-Commerce Store

This project is a microservices-based backend for an Android e-commerce store, built using Node.js and Express. It follows a distributed architecture with multiple services handling different business logic. An API Gateway is used to centralize requests, and RabbitMQ facilitates communication between services asynchronously.(Project is still under development)

🚀 Architecture Overview

• User Service: Manages user authentication, registration, and profile handling.
• Product Service: Handles product listing, details, and inventory management.
• API Gateway: Acts as the entry point, routing client requests to the respective services.
• RabbitMQ: Used as a message broker to enable event-driven communication between services.

🛠️ Technologies Used

• Node.js & Express – Backend framework for all microservices.
• RabbitMQ – Message broker for inter-service communication.
• MongoDB – Database for storing users and products.
• JWT (JSON Web Tokens) – Authentication and authorization.
• Docker – Containerization for easy deployment.
• Redis (Optional) – Can be used for caching user sessions or product data.

📌 Features

🧑‍💻 User Service

• User registration & authentication (JWT-based).
• Profile management (update user details, change password).
• Secure password hashing using bcrypt.

🛍️ Product Service

• Create, update, delete, and fetch products.
• Inventory management (track stock levels).
• Searching and filtering products.

🎯 API Gateway

• Centralized entry point for all client requests.
• Validates JWT tokens for authentication.
• Routes requests to the appropriate microservice.

🔄 Event-Driven Communication with RabbitMQ

• User Service → Product Service: Notify when a user registers.
• Product Service → User Service: Notify users about new product arrivals or stock updates.

🚀 Setup & Installation

Prerequisites

• Node.js (>= 14.x)
• MongoDB (local or cloud)
• RabbitMQ (running locally or in Docker)
• Docker (optional)

Steps to Set Up

1. Clone the repository

   git clone https://github.com/yourusername/ecommerce-microservices.git
   cd ecommerce-microservices

2. Set up environment variables
   Create a .env file for each service (user-service/.env, product-service/.env, api-gateway/.env) with the following keys:

   # Example for User Service
   PORT=5001
   MONGODB_URI=mongodb://localhost:27017/users
   JWT_SECRET=your_jwt_secret
   RABBITMQ_URI=amqp://localhost

3. Install dependencies for each service

   cd user-service && npm install
   cd ../product-service && npm install
   cd ../api-gateway && npm install

4. Start RabbitMQ (if using Docker)

   docker run -d --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:management

5. Start the microservices
   Open separate terminals and run:

   cd user-service && npm run dev
   cd ../product-service && npm run dev
   cd ../api-gateway && npm run dev

📡 API Endpoints

🧑 User Service

Method	Endpoint	Description
POST	/register	Register a new user
POST	/login	Authenticate user and return JWT
GET	/profile	Get user profile (Requires JWT)

🛒 Product Service

Method	Endpoint	Description
GET	/products	Fetch all products
POST	/products	Add a new product (Admin only)
GET	/products/:id	Get product details

🚪 API Gateway

Method	Endpoint	Description
POST	/api/users/register	Proxy to User Service
GET	/api/products	Proxy to Product Service

🛠️ Future Enhancements

• Order & Payment Service: Handle checkout and payments.
• Admin Panel: Dashboard for managing products and users.
• Notifications Service: Send push notifications and emails.

📝 License

This project is licensed under the MIT License.

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