NestJS Drizzle CRUD Generator Skill

NestJS Drizzle CRUD Generator

Overview

Automatically generates complete CRUD modules for NestJS applications using Drizzle ORM. Creates all necessary files following the zaccheroni-monorepo patterns: feature modules, controllers, services, Zod-validated DTOs, Drizzle schemas, and Jest unit tests.

When to Use

Creating new entity modules with full CRUD endpoints
Building database-backed features in NestJS
Generating type-safe DTOs with Zod validation
Adding services with Drizzle ORM queries
Creating unit tests with mocked database

Instructions

Step 1: Define Entity Fields

Gather entity definition:

Entity name (e.g., user, product, order)
List of fields with types (see references/field-types.md for supported types)
Required fields vs optional fields with defaults

Step 2: Run the Generator

python scripts/generate_crud.py --feature <name> --fields '<json-array>' --output <path>

Step 3: Verify Generated Files

Check that all expected files were created:

ls -la libs/server/<feature-name>/src/lib/

Expected structure:

controllers/
services/
dto/
schema/
<feature>-feature.module.ts

Step 4: Run TypeScript Compilation

cd libs/server && npx tsc --noEmit

Step 5: Execute Unit Tests

cd libs/server && npm test -- --testPathPattern=<feature-name>

Examples

Generate a User module

python scripts/generate_crud.py \
  --feature user \
  --fields '[{"name": "name", "type": "string", "required": true}, {"name": "email", "type": "email", "required": true}, {"name": "password", "type": "string", "required": true}]' \
  --output ./libs/server

Generate a Product module

python scripts/generate_crud.py \
  --feature product \
  --fields '[{"name": "title", "type": "string", "required": true}, {"name": "price", "type": "number", "required": true}, {"name": "description", "type": "text", "required": false}, {"name": "inStock", "type": "boolean", "required": false, "default": true}]' \
  --output ./libs/server

Generated Structure

libs/server/{feature-name}/
├── src/
│   ├── index.ts
│   └── lib/
│       ├── {feature}-feature.module.ts
│       ├── controllers/
│       │   ├── index.ts
│       │   └── {feature}.controller.ts
│       ├── services/
│       │   ├── index.ts
│       │   ├── {feature}.service.ts
│       │   └── {feature}.service.spec.ts
│       ├── dto/
│       │   ├── index.ts
│       │   └── {feature}.dto.ts
│       └── schema/
│           └── {feature}.table.ts

Features

Module

Uses forRootAsync pattern for lazy configuration
Exports generated service for other modules
Imports DatabaseModule for feature tables

Controller

Full CRUD endpoints: POST, GET, PATCH, DELETE
Query parameter validation for pagination
Zod validation pipe integration

Service

Drizzle ORM query methods
Soft delete support (via deletedAt column)
Pagination with limit/offset
Filtering support
Type-safe return types

DTOs

Zod schemas for Create and Update
Query parameter schemas for filtering
NestJS DTO integration

Tests

Jest test suite
Mocked Drizzle database
Test cases for all CRUD operations

Manual Integration

After generation, integrate into your app module:

// app.module.ts
import { {{FeatureName}}FeatureModule } from '@your-org/server-{{feature}}';

@Module({
  imports: [
    {{FeatureName}}FeatureModule.forRootAsync({
      useFactory: () => ({
        defaultPageSize: 10,
        maxPageSize: 100,
      }),
    }),
  ],
})
export class AppModule {}

Dependencies

Required packages:

@nestjs/common
@nestjs/core
drizzle-orm
drizzle-zod
zod
nestjs-zod

Best Practices

Verify before commit: Always run tsc --noEmit and tests before committing generated code
Customize services: Add business logic to generated services after validation
Database migrations: Create migrations separately for generated Drizzle schemas
Use generated types: Reference generated types in your application code
Review DTOs: Adjust Zod validation rules based on your API requirements

Constraints and Warnings

Soft delete only: Delete operations use soft delete (deletedAt timestamp). Hard deletes require manual modification
No authentication: Generated code does not include auth guards - add them based on your security requirements
Basic CRUD only: Complex queries, transactions, or business logic must be implemented manually
JSON escaping: Use single quotes around the JSON array when passing fields on command line

Agent Skills: NestJS Drizzle CRUD Generator

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