Serverless NestJS TypeORM CRUD

1) What This Is

A NestJS API running on AWS Lambda via the Serverless Framework, with CRUD endpoints for:

• Author
• Book

2) Current Architecture

• Lambda entrypoint: src/lambda.ts
• Root module: src/app.module.ts
• Modules:
  • src/modules/author/*
  • src/modules/book/*
• Entities:
  • src/entity/author.entity.ts
  • src/entity/book.entity.ts
• DB config: src/config/database.ts
• Serverless config: serverless.yml

3) Status After the Upgrade Cycle (2026-05-14)

Implemented

1. NestJS + TypeORM migrated to a modern stack:
   • NestJS 11
   • TypeORM 0.3
   • mysql2 driver
2. Removed @nestjsx/crud; introduced explicit CRUD controllers and services.
3. Migrated from tslint to ESLint (flat config).
4. Added a health endpoint:
   • GET /health (in serverless-offline: GET /local/health)
5. Fixed Lambda bootstrap/caching logic.
6. Updated serverless.yml to nodejs20.x runtime and proxy routing.
7. Added and fixed e2e tests for book and author CRUD flows.

Verification (Executed Locally)

• npm run build ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ✅
• npm run sls:offline + smoke (/local/health, /local/api/book) ✅

4) Running Locally

npm install
npm run sls:offline

Serverless Offline endpoints are stage-prefixed:

• http://localhost:3000/local/health
• http://localhost:3000/local/api/book
• http://localhost:3000/local/api/author

5) Plan for Further package.json Upgrades (Latest Versions)

The current combination is selected because it works end-to-end. Next wave toward absolute latest:

1. Serverless 4 migration
   • move serverless + serverless-offline to 4.x/14.x
   • handle mandatory authentication/license flow in CI/CD and local environments
2. TypeScript track
   • stay on TS 6.x and continuously monitor TS 7 breaking changes
3. Security hardening
   • systematically reduce high vulnerabilities via transitive updates and lockfile refresh
4. DB migrations
   • replace synchronize: true with proper TypeORM migrations for production
5. CI pipeline
   • add a pipeline that runs build/lint/test/e2e and optional sls package