# Nodejs Backend > Node.js backend patterns for scalable APIs, microservices, and enterprise applications. Use when this capability is needed. - Skill: `tomevault-io/nodejs-backend-2` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/nodejs-backend-2` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/nodejs-backend-2/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/nodejs-backend-2 --- # Node.js (Backend Patterns) Skill Enterprise Node.js backends using Express/Fastify, TypeScript, and architectural patterns. ## Core Principles - **TypeScript everywhere**. Fastify > Express (perf). - **Clean Architecture**: Controllers → Services → Repositories → Entities. - **12-Factor App**: Config from env, logging, health checks. ## Modular Behaviors - **Project Setup**: `npm init -y && npm i -D typescript @types/node tsx`. `npm i fastify`. - **API Structure**: `/src/routes`, `/src/services`, `/src/repositories`, `/src/entities`. - **Dependency Injection**: `awilix` or `tsyringe`. Singletons for DB/connections. - **Validation**: Zod schemas. `z.object({ name: z.string().min(1) })`. - **Auth**: JWT with `jsonwebtoken`. Refresh tokens. Role-based with guards. - **Database**: Prisma or Drizzle ORM. Connection pooling. Transactions for business logic. - **Error Handling**: Global handler. HTTP status + structured error payload. - **Testing**: `vitest` + `msw`. 80% coverage. Integration tests against test DB. - **Monitoring**: `pino` logger. Prometheus metrics. Health endpoints `/health`, `/ready`. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/ultraxn) — claim your Tome and manage your conversions.