NestJsTemplate

Overview

This is a reusable backend template built with NestJS (Fastify), designed to provide a structured and scalable starting point for API development.

It includes a modular architecture, validation layer, and clear separation of responsibilities to support building reliable backend systems.

Purpose

• provide a consistent backend foundation
• enforce structured API design
• handle validation and business logic securely

Core Structure

Modules

• Feature based module organisation

• Each module encapsulates:

  • routes (controllers)
  • services (business logic)
  • validation

API Layer

• Controllers define API endpoints
• Services handle all business logic
• Clear separation between request handling and logic

Validation

• Input validation using DTOs
• Ensures all incoming data is validated before processing
• Prevents invalid or unsafe operations

Technical Architecture

Backend

• NestJS (Fastify)

Handles:

• API routing and request handling
• validation and business logic
• structured service layer

Structure

root/
└── src/
    ├── modules/      # feature modules
    ├── common/       # shared utilities and helpers
    ├── config/       # environment and configuration
    └── main.ts       # application entry point

Features

• modular architecture
• structured API design
• validation layer using DTOs
• separation of concerns (controller / service)
• scalable foundation for backend systems

Usage

This template is intended to be used as a starting point:

• clone the repository
• install dependencies
• define modules and endpoints
• build features within the existing structure

Related Projects

• EloFlos
• EloFlosMerch
• NextJsTemplate
• Portfolio

Status

• Stable base structure
• Actively used for backend development

Notes

This template is intentionally focused on:

• structure
• scalability
• maintainability

It reflects the backend patterns used across my systems.