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ecommerce-store-api

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A production-grade NestJS modular monolith E-commerce API 🛒. Built as a reference implementation showcasing Strategic DDD, Hexagonal Architecture, Stripe SAGA orchestration, Redis Stack (JSON/Search), and zero cross-context leakage.

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# 🛒 E-commerce Store API

> An enterprise-grade NestJS API for an e-commerce store built with **Domain-Driven Design**, **Hexagonal Architecture**, and modern best practices.

## 📋 Table of Contents

- [What Is This?](#what-is-this)
- [How to Review This Project in 5 Minutes](#how-to-review-this-project-in-5-minutes)
- [🚀 Quick Start](#quick-start)
- [Architecture at a Glance](#architecture-at-a-glance)
- [⭐ Feature Catalog](#feature-catalog)
- [📖 Documentation Index](#documentation-index)
- [🚧 Roadmap](#roadmap)
- [🧪 Testing](#testing)
- [🏗️ Project Structure](#project-structure)
- [📄 License](#license)

---

## What Is This?

A production-grade e-commerce API built as a **modular monolith** with NestJS and TypeScript. The codebase implements Domain-Driven Design (both Strategic and Tactical), Hexagonal Architecture, and the distributed systems patterns that most tutorials skip — SAGA orchestration with compensation, strict bounded context isolation via ACL Gateways, Redis-backed idempotency, structured observability, and a full RSA-based auth stack with refresh token rotation and RBAC.

Designed as a reference for how to build enterprise backend systems that are testable, maintainable, and production-ready from day one.

---

## How to Review This Project in 5 Minutes

Start with the areas that demonstrate the most critical patterns:

| What to inspect                  | Why it matters                                            | Where to look                                                                   |
| :------------------------------- | :-------------------------------------------------------- | :------------------------------------------------------------------------------ |
| Checkout orchestration           | Shows multi-step business workflow and failure handling   | `src/modules/orders/core/application/usecases/checkout/`                        |
| SAGA compensation                | Shows stock release/refund/cancel behavior after failures | `src/modules/orders/primary-adapters/listeners/checkout-failure.listener.ts`    |
| Auth, RBAC, and refresh sessions | Shows production-style security decisions                 | `src/modules/authentication/`, [JWT-RSA-JWKS.md](docs/security/JWT-RSA-JWKS.md) |
| Redis idempotency                | Shows retry-safe critical API behavior                    | `src/infrastructure/idempotency/`                                               |
| Hexagonal boundaries             | Shows domain/application isolation from adapters          | [DDD-HEXAGONAL.md](docs/architecture/DDD-HEXAGONAL.md), `src/modules/*/core/`   |
| Observability                    | Shows logs, metrics, traces, and dashboards               | `src/infrastructure/metrics/`, `src/infrastructure/tracing/`, `docker/`         |
| Tests and factories              | Shows maintainability and behavior coverage               | `src/modules/*/*.spec.ts`, `src/modules/*/testing/`, `test/`                    |

The shortest walkthrough is: **Auth/RBAC → Checkout use case → SAGA compensation → Redis idempotency → tests**.

---

## 🚀 Quick Start

### Prerequisites

- **Node.js** ≥ 22 · **npm** ≥ 11 · **Docker Desktop** ≥ 28 · **Git** ≥ 2.49

### Installation

```bash
# 1. Clone & install
git clone https://github.com/raouf-b-dev/ecommerce-store-api.git
cd ecommerce-store-api
npm install

# 2. Generate environment files
npm run env:init

# 3. Update .env.* files with your secrets (DB, Redis, JWT keys)

# 4. Start infrastructure & run migrations
npm run d:up:dev
npm run migration:run:dev

# 5. Start the API
npm run start:dev
```

The API will be available at `http://localhost:3000` 🎉

📡 **API Documentation** — full endpoint specs, schemas, and auth requirements via Swagger UI: **`http://localhost:3000/api`**

#### Optional: Start the Full Monitoring Stack

```bash
# Start API + PostgreSQL + Redis + Prometheus + Loki + Tempo + Grafana
npm run d:up:full:prod
```

Grafana dashboards will be available at `http://localhost:3000` (Grafana port) with pre-provisioned datasources and dashboards.

---

## Architecture at a Glance

```mermaid
graph TD
    Client["📱 Client App (Web/Mobile)"] -->|HTTP/REST| API["🛡️ NestJS API Gateway"]
    Client -->|WebSocket| WS["🔌 WebSocket Gateway"]

subgraph "Application Core (Modular Monolith)"
        API --> Auth["🔐 Auth Module"]
        API --> Orders["📦 Orders Module"]
        API --> Products["🏷️ Products Module"]
        API --> Carts["🛒 Carts Module"]
        API --> Payments["💳 Payments Module"]
        API --> Inventory["🏭 Inventory Module"]
        API --> Customers["👥 Customers Module"]

WS --> Notifications["🔔 Notifications Module"]

Carts -->|Cache/Persist| Redis["⚡ Redis Stack"]
        Products -->|Search| Redis

Orders -->|Async Jobs| BullMQ["🐂 BullMQ Job Queue"]
        Notifications -->|Async Jobs| BullMQ
    end

subgraph "External Services"
        Payments <-->|Verify| Stripe["💳 Payment Gateway"]
    end
```

See the full [**System Architecture & Diagrams**](docs/architecture/ARCHITECTURE.md) for C4, sequence, and class diagrams.

---

## ⭐ Feature Catalog

> Every feature links to detailed documentation in [`docs/FEATURES.md`](docs/FEATURES.md) and/or the relevant source code.

### 🏗️ Architecture

| Feature                | Description                                               | Location                                                            |
| :--------------------- | :-------------------------------------------------------- | :------------------------------------------------------------------ |
| Strategic DDD          | Subdomains, Bounded Contexts, Context Mapping             | [ARCHITECTURE.md](docs/architecture/ARCHITECTURE.md)                |
| Tactical DDD           | Entities, Value Objects, Aggregates, Domain Services      | `src/modules/*/core/domain/`                                        |
| Hexagonal Architecture | Ports & Adapters — infrastructure-agnostic domain core    | [DDD-HEXAGONAL.md](docs/architecture/DDD-HEXAGONAL.md)              |
| ACL Gateway Pattern    | 8 gateway ports decoupling 10 bounded contexts            | [INTEGRATION-PATTERNS.md](docs/integration/INTEGRATION-PATTERNS.md) |
| Modular Monolith       | 10 isolated modules, microservice-extraction ready        | `src/modules/`                                                      |
| Result Pattern         | Functional `Result<T, E>` replacing exception-driven flow | `src/shared-kernel/domain/`                                         |

### 🔄 Distributed Systems

### ⚡ Data & Performance

| Feature               | Description                                                 | Location                                                  |
| :-------------------- | :---------------------------------------------------------- | :-------------------------------------------------------- |
| RedisJSON             | Cart storage as native JSON documents — no SQL joins        | `src/modules/carts/secondary-adapters/`                   |
| RedisSearch           | Full-text search and filtering from Redis                   | `src/modules/products/secondary-adapters/`                |
| Cache-Aside Decorator | Transparent `CachedRepository` wrapping Postgres with Redis | `src/modules/*/secondary-adapters/repositories/cached-*/` |

### 🔐 Security

| Feature                | Description                                                  | Location                                         |
| :--------------------- | :----------------------------------------------------------- | :----------------------------------------------- |
| RSA JWT (RS256 + JWKS) | Production-grade auth with public key distribution endpoint  | [JWT-RSA-JWKS.md](docs/security/JWT-RSA-JWKS.md) |
| Refresh Token Rotation | Session-based tokens with SHA-256 hashing + HttpOnly cookies | `src/modules/authentication/`                    |
| RBAC System            | Database-backed Roles & Permissions with `PermissionsGuard`  | `src/modules/authorization/`                     |
| API Rate Limiting      | Redis-backed throttling via `@nestjs/throttler`              | `src/infrastructure/throttler/`                  |
| Helmet Headers         | Standard security headers (HSTS, X-Frame-Options, etc.)      | `src/main.ts`                                    |
| CORS Whitelist         | Environment-based origin restriction — no wildcards in prod  | `src/config/`                                    |
| XSS Sanitization       | Global `sanitize-html` interceptor on all request bodies     | `src/interceptors/`                              |
| Pagination Safety      | `@Max(100)` on all query DTOs to prevent resource exhaustion | `src/modules/*/primary-adapters/dtos/`           |

### 📦 Infrastructure

| Feature            | Description                                                   | Location                                                         |
| :----------------- | :------------------------------------------------------------ | :--------------------------------------------------------------- |
| Multi-Stage Docker | 4-stage build, Node.js 24 Alpine, tini PID 1, non-root user   | `Dockerfile`                                                     |
| Graceful Shutdown  | Signal handling, connection draining, worker cleanup          | [PROCESS-LIFECYCLE.md](docs/infrastructure/PROCESS-LIFECYCLE.md) |
| Health Checks      | `GET /health` via @nestjs/terminus (Postgres + Redis + WS)    | `src/modules/health/`                                            |
| API Versioning     | URI-based versioning (`/v1/`) for all API endpoints           | `src/modules/*/`                                                 |
| Admin Seeder       | Bootstrap admin user and role/permission data on first deploy | [ADMIN-BOOTSTRAP.md](docs/security/ADMIN-BOOTSTRAP.md)           |
| Multi-Env Config   | 4 profiles with type-safe validation + secrets separation     | [SECRETS-MANAGEMENT.md](docs/security/SECRETS-MANAGEMENT.md)     |

### 🔭 Observability

### 🧪 Testing

| Feature                  | Description                                         | Location                 |
| :----------------------- | :-------------------------------------------------- | :----------------------- |
| Unit + Integration Suite | Domain logic, use cases, repositories, controllers  | `src/modules/*/`         |
| Test Factories           | Scenario-specific domain object builders per module | `src/modules/*/testing/` |
| Typed Mock Repos         | Interface-compliant mocks with test helper methods  | `src/modules/*/testing/` |

---

## 📖 Documentation Index

| Document                                                                      | Description                                               |
| :---------------------------------------------------------------------------- | :-------------------------------------------------------- |
| [**FEATURES.md**](docs/FEATURES.md)                                           | Detailed feature documentation with code locations        |
| [**docs/README.md**](docs/README.md)                                          | Unified technical documentation index                     |
| [**ARCHITECTURE.md**](docs/architecture/ARCHITECTURE.md)                      | C4 system context, domain flows, sequence diagrams        |
| [**DDD-HEXAGONAL.md**](docs/architecture/DDD-HEXAGONAL.md)                    | Canonical DDD & Hexagonal Architecture rules              |
| [**INTEGRATION-PATTERNS.md**](docs/integration/INTEGRATION-PATTERNS.md)       | ACL Gateway, SAGA, Domain Events, Outbox                  |
| [**JWT-RSA-JWKS.md**](docs/security/JWT-RSA-JWKS.md)                          | RSA JWT implementation and JWKS endpoint details          |
| [**SECRETS-MANAGEMENT.md**](docs/security/SECRETS-MANAGEMENT.md)              | Configuration taxonomy and key rotation                   |
| [**ADMIN-BOOTSTRAP.md**](docs/security/ADMIN-BOOTSTRAP.md)                    | Admin seeding, role/permission initialization             |
| [**MONITORING-STACK-GUIDE.md**](docs/observability/MONITORING-STACK-GUIDE.md) | Grafana, Prometheus, Loki, Tempo setup and usage          |
| [**Observability Architecture**](docs/observability/ARCHITECTURE.md)          | Signal pipeline diagram (logs, metrics, traces → Grafana) |
| [**PROCESS-LIFECYCLE.md**](docs/infrastructure/PROCESS-LIFECYCLE.md)          | PIDs, signals, and graceful shutdown deep-dive            |
| [**ROADMAP.md**](docs/ROADMAP.md)                                             | Production readiness checklist with prioritized tasks     |
| [**TROUBLESHOOTING.md**](docs/infrastructure/TROUBLESHOOTING.md)              | Common issues and solutions                               |
| [**AGENT.md**](AGENT.md)                                                      | Coding guidelines and conventions                         |

---

## 🚧 Roadmap

This project is continuously evolving. See the full [**ROADMAP.md**](docs/ROADMAP.md) for completed phases, current work, and upcoming features.

---

## 🧪 Testing

```bash
npm test              # Run all unit tests
npm run test:cov      # Generate coverage report
npm run test:e2e      # End-to-end tests
npm run test:ci       # CI mode (GitHub Actions)
```

---

## 🏗️ Project Structure

```
src/
├── shared-kernel/           # Pure domain building blocks (Result, Value Objects, base UseCase)
├── infrastructure/          # Global secondary adapters (DB, Redis, BullMQ, JWT, logging, WebSocket)
├── interceptors/            # Global Result Interceptor
├── modules/                 # Feature Modules (Bounded Contexts)
│   └── [module]/
│       ├── core/domain/     # Entities, Value Objects, Repository Ports
│       ├── core/application/# Use Cases & Application Services
│       ├── primary-adapters/# DTOs, Controllers, Job Handlers, Listeners
│       ├── secondary-adapters/# Repositories, Gateways, Schedulers
│       └── testing/         # Module-specific mocks & factories
├── config/                  # Environment validation & configuration
└── main.ts                  # Application bootstrap
```

> For strict DDD and Hexagonal Architecture definitions, see [DDD-HEXAGONAL.md](docs/architecture/DDD-HEXAGONAL.md).

---

## 📄 License

Released under the [MIT License](LICENSE).

---

**Built by [Abderaouf .B](https://github.com/raouf-b-dev)** · [Issues](https://github.com/raouf-b-dev/ecommerce-store-api/issues) · [Repository](https://github.com/raouf-b-dev/ecommerce-store-api)

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