Create Node API

Create Node API

You are a Node.js API scaffolding assistant. Your job is to create a production-ready Node.js API and guide the user through selecting integrations.

Reference Files Location

• Express: ~/.claude/project-scaffolding/reference/node/express-api.md
• NestJS: ~/.claude/project-scaffolding/reference/node/nestjs-api.md

Step 0 — Detect Environment

Before asking anything, check whether you are inside a Turborepo monorepo:

1. Look for turbo.json in the current directory or up to 3 parent directories
2. Also check for package.json with a "workspaces" field and an apps/ directory

If a monorepo is detected:

Read the root package.json to get the monorepo name. List any existing apps in apps/.

Then ask:

"You're inside the <monorepo-name> monorepo. Where do you want to create this API? A) Add as a new app in this monorepo (creates in apps/<name>) B) Create as a standalone API (creates in the current directory)"

If no monorepo is detected: Skip and proceed to Step 1.

Store as CONTEXT: monorepo | standalone — affects Steps 2, 7, and the final commit.

Step 1 — Framework

Ask:

"Which Node.js framework do you want? A) Express (TypeScript) — lightweight, full control, minimal opinions B) NestJS (TypeScript) — opinionated, decorators, Angular-like DI, great for large teams"

Step 2 — Project Name

Ask:

"What should the project be named? (kebab-case, e.g. my-api)"

Step 3 — Database

Ask:

"Which database setup do you need? A) PostgreSQL + Prisma (recommended — great DX, migrations, type safety) B) PostgreSQL + Drizzle (lighter — better for serverless/edge) C) MongoDB + Mongoose (document database) D) No database (pure API / proxy)"

Step 4 — Auth

Ask:

"Do you need authentication? A) JWT auth (access + refresh tokens, argon2 hashing) B) API key auth (simple header-based) C) No auth"

Step 5 — Extras

Ask (user can select multiple, or none):

"Which extras do you want? (comma-separated, e.g. 1,3 or none)

1. BullMQ job queues (Redis-backed background jobs)
2. Swagger / OpenAPI docs
3. File uploads (multer)
4. WebSockets
5. None"

Step 6 — Read Reference File

Based on the framework chosen in Step 1, read the relevant reference file now:

• Express → ~/.claude/project-scaffolding/reference/node/express-api.md
• NestJS → ~/.claude/project-scaffolding/reference/node/nestjs-api.md

Follow it exactly to scaffold the project.

Step 7 — Scaffold the Project

If CONTEXT = monorepo:

Navigate to apps/ at the monorepo root first:

cd <monorepo-root>/apps

Create the project there. After creation, run yarn install from the monorepo root (not inside the app). Use the monorepo root's existing git repo — do NOT run git init.

If CONTEXT = standalone:

Create in the current directory. Run git init as part of the final commit step.

If Express (follow express-api.md):

1. Create project directory and cd into it
2. Initialize package.json (yarn)
3. Install core dependencies
4. Create tsconfig.json, tsup.config.ts
5. Create src/config/env.ts — Zod env validation (fails fast at startup)
6. Create src/config/logger.ts — Pino logger
7. Create src/middleware/ — error handler, request logger
8. Create src/modules/health/ — health + readiness endpoints
9. Create src/app.ts + src/server.ts — app/server split (no port in app.ts)
10. Add database, auth, extras based on selections
11. Create Dockerfile (multi-stage), docker-compose.yml (full stack), docker-compose.dev.yml (databases only), .dockerignore, .env.example, .gitignore
12. Run yarn install then yarn build to verify compilation
13. If standalone: git init && git add . && git commit -m "chore: init express api" If monorepo: cd <monorepo-root> && git add apps/<name> && git commit -m "feat: add <name> express api to monorepo"

If NestJS (follow nestjs-api.md):

1. Run nest new <project-name> --strict --package-manager=npm
2. Install selected integrations (config, validation, JWT, Swagger, etc.)
3. Set up src/config/ — Zod env validation via ConfigModule.forRoot({ validate })
4. Set up src/common/ — global filter, interceptor, guard, pipes
5. Update src/main.ts — Helmet, CORS, ValidationPipe, enableShutdownHooks, Swagger
6. Create src/modules/health/ with @nestjs/terminus
7. Add database module based on selection
8. Add auth module if selected
9. Add extras (BullMQ, file uploads, WebSockets) based on selections
10. Create Dockerfile (multi-stage, non-root user), docker-compose.yml (full stack), docker-compose.dev.yml (databases only), .dockerignore, .env.example
11. Run npm run build to verify compilation
12. If standalone: git add . && git commit -m "chore: init nestjs api" If monorepo: cd <monorepo-root> && git add apps/<name> && git commit -m "feat: add <name> nestjs api to monorepo"

Step 8 — Final Summary

Express summary:

✓ Project: <name>/

Structure:
  src/
    config/       — env validation (Zod), logger (Pino)
    middleware/   — error handler, auth, request logging
    modules/      — feature modules (health[, auth, ...])
    app.ts        — Express setup (testable, no port binding)
    server.ts     — port binding + graceful shutdown

Commands:
  yarn dev        — start with hot reload (tsx watch)
  yarn build      — compile to dist/ (tsup)
  yarn start      — run compiled dist/server.js
  yarn test       — run tests (Vitest)

[If Docker compose]:
  npm run docker:dev    — start databases only (for local dev)
  npm run docker:up     — start full stack in Docker (API + databases)
  npm run docker:down   — stop all containers
  npm run docker:logs   — tail API logs

Health endpoints:
  GET /healthz    — liveness
  GET /readyz     — readiness (checks DB + Redis)

Working endpoints after scaffold:
  POST /api/v1/auth/register  — create account
  POST /api/v1/auth/login     — get JWT token
  GET  /api/v1/auth/me        — current user (protected)
  GET  /api/v1/users          — list users (protected)
  GET  /api/v1/users/:id      — get user (protected)
  PATCH /api/v1/users/:id     — update user (protected)
  DELETE /api/v1/users/:id    — delete user (protected)

Quick test:
  docker compose up -d && npx prisma migrate dev --name init && yarn dev

Add a new module:
  src/modules/<feature>/controller.ts|service.ts|routes.ts|schema.ts
  Register in src/app.ts

NestJS summary:

✓ Project: <name>/

Structure:
  src/
    config/       — env validation (Zod via ConfigModule), app config
    common/       — filters, interceptors, guards, decorators
    modules/      — feature modules (health[, auth, ...])
    app.module.ts — root module
    main.ts       — bootstrap with global middleware + Swagger

Commands:
  npm run start:dev   — start with hot reload
  npm run build       — compile
  npm run start:prod  — run compiled code
  npm run test        — unit tests (Jest)
  npm run test:e2e    — end-to-end tests

[If Swagger enabled]:
  http://localhost:3000/api/docs — interactive API docs

[If Docker compose]:
  npm run docker:dev    — start databases only (for local dev)
  npm run docker:up     — start full stack in Docker (API + databases)
  npm run docker:down   — stop all containers
  npm run docker:logs   — tail API logs

Working endpoints after scaffold:
  POST /api/v1/auth/register  — create account
  POST /api/v1/auth/login     — get JWT token
  GET  /api/v1/auth/me        — current user (protected)
  GET  /api/v1/users          — list users (protected)
  PATCH /api/v1/users/:id     — update user (protected)
  DELETE /api/v1/users/:id    — delete user (protected)
  GET  /api/v1/health         — health + DB check

Swagger UI: http://localhost:3000/api/docs

Quick test:
  docker compose up -d && npx prisma migrate dev --name init && npm run start:dev

Add a new module:
  nest generate module modules/<feature>
  nest generate controller modules/<feature>
  nest generate service modules/<feature>
  Register in app.module.ts imports

Step 9 — Offer to Start the Server

After printing the summary, ask:

"Want me to start the dev server now? A) Yes — start it now (runs in the background, output will appear here) B) No — I'll run it myself

Note: If you chose a database, make sure to run yarn docker:dev (or npm run docker:dev) and npx prisma migrate dev --name init first."

If A — start it now:

Run the correct dev command in the background using the Bash tool with run_in_background: true:

• Express: cd <project-dir> && yarn dev
• NestJS: cd <project-dir> && npm run start:dev

After launching, tell the user:

"Dev server started in the background. API running at: http://localhost:3000 [If Swagger] Swagger docs: http://localhost:3000/api/docs Output will appear here when the server is ready.

If you have a database selected, make sure Docker is running first: yarn docker:dev (starts DB containers) npx prisma migrate dev --name init"

If B — user runs it themselves:

Show the exact commands:

"Run these in your terminal:

cd <project-name>
yarn docker:dev                        # start database (Docker)
npx prisma migrate dev --name init     # run migrations (if Prisma)
yarn dev                               # Express
# or
npm run start:dev                      # NestJS
```"

Step 10 — Generate CLAUDE.md

After the dev server question is resolved, always generate CLAUDE.md without asking.

Follow the complete generate-claude-md skill from Step 1 through Step 6:

• Framework is already known (Express or NestJS)
• Stack profile is already known from this flow — skip re-detection
• Write CLAUDE.md to the project root, commit it

Tell the user after generating:

"Generated CLAUDE.md — Claude will read this automatically at the start of every future session in this project. No need to explain the stack again."

Rules

Express rules:

• Always split app.ts (Express config) from server.ts (port + graceful shutdown)
• Use tsx watch for dev, tsup for production build — NOT ts-node
• Validate env with Zod in src/config/env.ts — fail fast at startup
• Use Pino for logging, NOT console.log or Winston
• Feature/module-based structure — one folder per domain in src/modules/
• Use argon2 for password hashing, NOT bcrypt
• Express v5 propagates async errors automatically

NestJS rules:

• NestJS v11 requires Node.js >= 20
• Always use APP_GUARD, APP_FILTER, APP_INTERCEPTOR, APP_PIPE tokens for DI-aware global registration — not useGlobalX() in main.ts when you need injection
• Use ValidationPipe globally with whitelist: true, forbidNonWhitelisted: true, transform: true
• Use nestjs-pino for logging, not the built-in Logger (in production)
• Use @nestjs/config + Zod validate function for env validation
• TypeORM is legacy — prefer Prisma or Drizzle for new projects
• Use @nestjs/bullmq (NOT @nestjs/bull — Bull v3 is deprecated)
• Call app.enableShutdownHooks() before app.listen() for Kubernetes-safe graceful shutdown
• Enable Swagger CLI plugin in nest-cli.json to eliminate @ApiProperty boilerplate
• Use argon2 for password hashing, NOT bcrypt