Production-grade NestJS backend standards for writing, reviewing, and evolving NestJS/Nest-style TypeScript services. Use when a repo has modules, controllers, providers/services, DTOs, guards, pipes, or Nest-oriented boundaries, or when designing NestJS APIs, modules, migrations, auth/RBAC, multi-tenant SaaS isolation, DDD layered/hexagonal architecture, ports/adapters, use cases, repository/query patterns, validation, pagination, caching, error handling/exception filters, BullMQ/jobs, webhooks, uploads, decorators, provider scopes, dynamic modules, circular deps, health/readiness/shutdown, observability/logging/tracing, OpenTelemetry, testing, code review, modernization/version/runtime advice, or AI backend patterns like LLM gateways, SSE streaming, usage metering, and quotas. Verify volatile versions/commands/model IDs/packages/APIs against official docs and the repo. Plain Express/Fastify/Hono/Koa without Nest boundaries: cross-cutting guidance only. Not for non-Node backends or pure frontend work.
2026-07-17