nestjs-best-practices

name	nestjs-best-practices
description	NestJS best practices — 40 rules across modules, DI, error handling, security, performance, testing, database, API design, microservices, and deployment. Use when writing, reviewing, or refactoring NestJS code.

NestJS Best Practices

Comprehensive best practices guide for NestJS applications. Contains 40 rules across 10 categories, prioritized by impact to guide automated refactoring and code generation.

Rule Categories by Priority

Priority	Category	Impact	Prefix
1	Architecture	CRITICAL	arch-
2	Dependency Injection	CRITICAL	di-
3	Error Handling	HIGH	error-
4	Security	HIGH	security-
5	Performance	HIGH	perf-
6	Testing	MEDIUM-HIGH	test-
7	Database & ORM	MEDIUM-HIGH	db-
8	API Design	MEDIUM	api-
9	Microservices	MEDIUM	micro-
10	DevOps & Deployment	LOW-MEDIUM	devops-

How to find a rule

Each rule lives in its own file under rules/, named <prefix>-<rule>.md (e.g. rules/arch-avoid-circular-deps.md, rules/security-validate-all-input.md); the prefixes map to the category table above and rules/_sections.md lists every rule per category. Read only the rules the task touches — each file carries the why, an incorrect and a correct code example, and extra context.