Overall Architecture
Relevant source files
The following files were used as context for generating this wiki page:
The Marketplace project implements a full-stack eCommerce application using a decoupled architecture. It consists of a frontend application built with Angular v13 and a backend service powered by NestJS v8. The system enables users to browse products, manage accounts, and interact with a marketplace environment.
The frontend handles user interface rendering, client-side routing, and state management, while the backend manages business logic, data persistence via MongoDB, and authentication. Communication between the two tiers occurs through HTTP requests, often managed by interceptors for security.
Sources: README.md:1-2, marketplace-frontend/package.json:1-40, marketplace-backend/app/package.json:1-45
System Overview
The architecture follows a standard client-server model. The frontend is a Single Page Application (SPA) that communicates with a RESTful API provided by the backend.
This diagram illustrates the high-level flow of data from the user interface through the backend layers to the database.
Sources: marketplace-frontend/src/app/app.module.ts:25-78, marketplace-backend/app/src/modules/customers/customers.module.ts:1-40
Frontend Architecture (Angular)
The frontend application is structured into modules, components, and services. It uses Angular Material for UI components and Less for styling.
Core Technologies
| Technology | Version | Description |
|---|---|---|
| Angular | ^13.1.1 | Core framework for the SPA |
| NgRx | ^13.0.2 | Reactive state management |
| RxJS | ^7.5.1 | Asynchronous stream handling |
| Angular Material | ^13.1.1 | UI Component library |
Sources: marketplace-frontend/package.json:15-30
Module Structure
The AppModule serves as the root container, importing specialized feature modules:
- MarketHeaderModule: Manages the top navigation bar, including user login and language switching.
- MarketFooterModule: Handles the application footer.
- MatSidenavModule: Provides the side navigation drawer for mobile and desktop layouts.
Sources: marketplace-frontend/src/app/app.module.ts:18-30
Layout and Styling
The application uses a responsive wrapper layout defined in app.component.less. It employs a sidebar width of 300px (reduced to 256px on small screens) and absolute positioning for the main content area to accommodate the fixed header.
Sources: marketplace-frontend/src/app/app.component.less:5-50
Backend Architecture (NestJS)
The backend follows the NestJS modular pattern, organizing code into Modules, Controllers, Services, and Repositories.
Component Responsibilities
- Modules: Group related components (e.g.,
CustomersModule). - Controllers: Handle incoming HTTP requests and return responses (e.g.,
CustomersController). - Services: Contain the core business logic (e.g.,
CustomersService). - Repositories: Manage data access logic for Mongoose/MongoDB (e.g.,
CustomersRepository).
Sources: marketplace-backend/app/src/modules/customers/customers.module.ts:8-37
Data Access Layer
The backend uses Mongoose for Object Document Mapping (ODM). The CustomersModule registers schemas for Customer and Role to facilitate database operations.
This class diagram shows the internal dependency injection structure within the backend modules.
Sources: marketplace-backend/app/src/modules/customers/customers.module.ts:1-40
Communication and Security
The system secures API communication using JWT (JSON Web Tokens).
- Backend Security: The backend utilizes
passportandpassport-jwtfor authentication. - Frontend Interception: The
AuthInterceptorin the Angular application automatically attaches authentication tokens to outgoing HTTP requests. - Validation: The backend uses
class-validatorto ensure incoming request payloads meet defined criteria.
Sources: marketplace-backend/app/package.json:50-65, marketplace-frontend/src/app/app.module.ts:72-76
Summary
The Marketplace architecture leverages modern TypeScript frameworks to separate concerns between the UI and server logic. The Angular frontend provides a responsive experience with centralized state management, while the NestJS backend ensures scalable business logic and secure data persistence through MongoDB.