A RESTful API built with NestJS to practice and apply backend development concepts, focusing on clean architecture, data validation, security, and maintainability.
The project implements a complete CRUD flow using a service-based architecture and a cloud-hosted MongoDB database.
Architecture & Structure
The application follows NestJS best practices, separating concerns using controllers, services, and modules.
Controllers handle incoming requests and delegate business logic to services, ensuring a clean and scalable structure.
Controller
Services
Module
Database & Persistence
Data persistence was implemented using MongoDB, hosted on MongoDB Atlas, enabling cloud-based data storage and environment-independent configuration.
The API performs full CRUD operations against the database.
Data Validation & Security
Data transfer and validation were handled using DTOs, combined with ValidationPipe, class-validator, and class-transformer.
These mechanisms help prevent invalid or malicious data from reaching the application core, improving security and data integrity.
Configuration & Environment Management
Application configuration was managed using @nestjs/config, allowing environment-specific variables to be stored in .env files and adapted across different deployment environments.
Error Handling & Request Control
Advanced request handling was implemented using:
- Exception filters to catch and standardize error responses
- Guards to protect routes and control access
- Interceptors to wrap and transform API responses
- Custom pipes to validate and transform incoming data
Filter
Guard
Interceptor
Custom pipe