Does this skill support TypeScript?

Yes, the skill provides TypeScript-first implementations for both Express and Fastify, including full type definitions for request handlers and services.

Can I use this for microservices architectures?

Absolutely. The patterns are designed for scalability and can be applied to individual microservices or monolithic backend architectures.

Does it include security best practices?

Yes, it includes configurations for essential security middleware like Helmet, CORS, and password hashing using bcrypt.

How does it handle request validation?

It provides middleware patterns for schema-based validation using Zod for Express and native JSON schema validation for Fastify.

Which databases are supported by these patterns?

While the repository examples use PostgreSQL, the Repository pattern implementation is designed to be database-agnostic, supporting both SQL and NoSQL integrations.

Node.js Backend Patterns

Name: Node.js Backend Patterns
Author: 3commas-io

by3commas-io

API Development

Implements scalable Node.js backend architectures using Express or Fastify with production-ready patterns for authentication, data access, and error handling.

About

This skill provides comprehensive guidance for building production-ready Node.js backend services, offering boilerplate and architectural patterns for both Express and Fastify frameworks. It helps developers implement robust layered architectures—including Controller, Service, and Repository layers—alongside dependency injection and secure middleware patterns. Whether you are building REST APIs, GraphQL backends, or microservices, this skill ensures best practices in error handling, security headers, and database integration are consistently applied across your project.

Key Features

Dual-framework support for Express.js and high-performance Fastify
0 GitHub stars
Type-safe dependency injection and container patterns
JWT-based authentication and role-based authorization middleware
Standardized layered architecture (Controller-Service-Repository)
Schema-based request validation using Zod and native Fastify schemas

Use Cases

Architecting a new RESTful API with a scalable and maintainable folder structure
Implementing secure middleware for authentication, logging, and request validation
Decoupling business logic from data access using the Repository pattern

About

Key Features

Dual-framework support for Express.js and high-performance Fastify
0 GitHub stars
Type-safe dependency injection and container patterns
JWT-based authentication and role-based authorization middleware
Standardized layered architecture (Controller-Service-Repository)
Schema-based request validation using Zod and native Fastify schemas

Use Cases

Architecting a new RESTful API with a scalable and maintainable folder structure
Implementing secure middleware for authentication, logging, and request validation
Decoupling business logic from data access using the Repository pattern