Express.js Enterprise Architecture Setup Guide

A step-by-step tutorial for setting up a scalable, enterprise-ready Express.js application architecture from scratch. This guide focuses on the initial setup and foundational patterns that can be applied to any domain.

🎯 What You’ll Build

By the end of this guide, you’ll have a production-ready Express.js application with:

• Domain-driven architecture for scalable code organization
• Type-safe development with TypeScript
• Database integration with MikroORM and MongoDB
• Authentication & authorization system
• Comprehensive middleware stack
• Error handling strategy
• Testing infrastructure
• Development workflow with hot reloading

📋 Prerequisites

• Node.js 18+ installed
• MongoDB running locally or connection string to MongoDB Atlas
• Basic knowledge of Express.js and TypeScript
• Code editor (VS Code recommended)

🚀 Step 1: Project Initialization