The Ultimate Production-Level Code Structure Guide (Full Walkthrough) | Node.js | Backend

Master Production-Ready Code Organization! Learn the exact folder structure, naming conventions, and architectural patterns used by senior developers to build scalable, maintainable applications.

View Notes : https://drive.google.com/file/d/1KWZC...


WHAT YOU'LL LEARN:
🔹 1. CONSTANTS ORGANIZATION

How to extract 90% of hardcoded values into constants.
Proper enum usage for type safety and autocompletion.
Route constants, module constants, and message constants.

Clean import patterns using index.ts files

🔹 2. GLOBAL CODE ARCHITECTURE

When to use global vs local modules
Base handlers, controllers, and interfaces
Shared middleware patterns (JWT, Rate Limiting, etc.)

Global services (Payments, Email, File Upload)

🔹 3. ENVIRONMENT CONFIGURATION

Beyond just secrets: application behavior configs
Feature flags and environment-specific settings
Proper .env variable naming conventions

Database and third-party service configurations

🔹 4. NAMING CONVENTIONS

Self-explanatory variable and function names
File naming: PascalCase vs underscore patterns
.env variables: UPPERCASE hierarchical naming

Clear, unambiguous naming for better readability

🔹 5. MODULE STRUCTURE

Feature-based modular architecture
Global modules vs local modules
Complete Auth module example

Module-specific controllers, services, and utilities

🔹 6. HIERARCHY & IMPORT STRUCTURE

Top → bottom import flow (never bottom → top)
Sibling imports only within modules
Avoiding circular dependencies

Maintaining clean separation of concerns"