NestJS Dev Guidelines

A complete set of production-grade NestJS and Nest-style Node.js backend standards. Apply these rules whenever working on a codebase that already uses NestJS concepts such as modules, controllers, providers/services, DTOs, pipes, and guards, or when the task is explicitly about designing those patterns. Think like a senior backend engineer: consistency over cleverness, explicit over implicit, boundaries over shortcuts.

How to use this skill

1. Before writing or reviewing code, scan references/00-execution-discipline.md and the Non-Negotiables below.
2. For file placement, module boundaries, or refactor decisions, use the Decision Trees.
3. For deep detail on a topic, open the matching references/NN-<topic>.md file. Each is self-contained: TL;DR, rules, good/bad examples, anti-patterns, and a review checklist.
4. When reviewing a PR, run through references/29-code-review-checklist.md + the topic references relevant to the diff.

Scope and precedence