NestJS Enterprise Backend Assistant

AI-optimized prompt for zero-configuration NestJS backend development with hexagonal architecture and enterprise standards. Complete production-ready API with guaranteed verification.

🚀 Quick Start

Submit to AI Assistant

Copy the NestJS Enterprise Backend Assistant prompt → Submit to your AI:

  • VS Code Copilot: Agent mode for automatic backend implementation
  • Cursor: AI chat for guided API setup
  • Claude/ChatGPT: Direct conversation for step-by-step backend build

AI Output Guarantee

Structured implementation with: ✅ Latest package versions from official NestJS docs
✅ Complete hexagonal architecture configuration
✅ Working authentication & authorization system
✅ Comprehensive database integration
✅ Full verification that everything works

🎯 What You Get

Enterprise-Ready Backend Stack

| Component | Benefit | |———–|———| | NestJS + TypeScript | Latest framework with strict type safety | | Hexagonal Architecture | Clean separation of concerns, domain-driven design | | JWT Authentication | Complete auth system with RBAC and refresh tokens | | Database Integration | TypeORM/Prisma with migrations and transactions | | Production Toolchain | ESLint, Prettier, Jest, Docker configured |

Optimized Architecture 

✅ Domain-driven design          ❌ Monolithic controller structure
✅ Layer separation              ❌ Business logic in controllers  
✅ Interface-based repositories  ❌ Direct database calls
✅ Dependency injection          ❌ Tight coupling
✅ Comprehensive testing         ❌ Minimal test coverage

Production Features

  • Authentication System: JWT strategy with access/refresh tokens
  • Authorization: Role-based access control with guards and decorators
  • Database Layer: Repository pattern with TypeORM/Prisma support
  • API Documentation: Swagger with authentication schemas
  • Security: Rate limiting, CORS, helmet, input validation
  • Quality Assurance: 100% working verification with Docker deployment

🧠 AI Prompt Engineering Excellence

Why This Prompt Works

Mission-Driven Structure:

  • Clear enterprise backend assistant role with hexagonal architecture focus
  • Mandatory web verification before any package installation
  • Compatible version determination across NestJS ecosystem
  • Structured installation from official documentation sources
  • Built-in verification with API endpoint testing

Production-Ready Focus:

  • Zero-configuration deployment environment
  • All tools configured, tested, and verified to work perfectly
  • Hexagonal architecture with proper layer separation
  • Complete deliverables with Docker and database setup
  • Success criteria with automated verification checks

📈 Problem Solved

Before: Manual NestJS Setup

❌ Days researching compatible NestJS, TypeORM, JWT versions
❌ Architecture confusion - controllers with business logic
❌ Security gaps - incomplete authentication, missing validation
❌ Database issues - no migrations, transaction handling
❌ Deployment uncertainty - no Docker, environment configuration

After: Enterprise Backend Assistant

✅ Structured approach with mandatory official documentation verification
✅ Version compatibility - determined programmatically across ecosystem
✅ Hexagonal architecture - clean separation, domain-driven design
✅ Enterprise-complete - auth, RBAC, database, security, Docker
✅ Quality guarantee - task incomplete until all API endpoints work
✅ Production-ready - all features tested and deployment verified

🏢 Enterprise Applications

Industry Use Cases

Financial Services: Transaction processing, audit trails, compliance
Healthcare: Patient data APIs, HIPAA compliance, secure authentication
E-commerce: Order management, payment processing, inventory APIs
SaaS Platforms: Multi-tenant architecture, subscription management

Team Benefits

Startups: MVP-ready API foundation with enterprise scaling
Agencies: Consistent client backend architecture
Enterprises: Standardized microservice development
Education: Modern NestJS best practices demonstration

🔧 Technical Specifications

Core Backend Stack

| Layer | Technology | Purpose | |——-|————|———| | Framework | NestJS + TypeScript | Enterprise Node.js framework with decorators | | Architecture | Hexagonal/Clean | Domain-driven design with layer separation | | Authentication | JWT + Passport | Complete auth system with RBAC | | Database | TypeORM/Prisma | ORM with migrations and transaction support | | Validation | Class Validator | DTO validation with decorators | | Documentation | Swagger/OpenAPI | Auto-generated API documentation | | Security | Helmet + Throttling | Production security middleware | | Testing | Jest + Supertest | Unit and E2E testing framework |

Hexagonal Architecture Layers

  • Domain Layer: Business entities, repository interfaces, domain services
  • Application Layer: Use cases, DTOs, application services, commands
  • Infrastructure Layer: Database implementations, external adapters
  • Presentation Layer: Controllers, guards, middleware, API routes

Security Features

  • JWT Strategy: Access/refresh token mechanism with proper expiration
  • Role-Based Access: Decorators and guards for endpoint protection
  • Input Validation: Request/response validation with class-validator
  • Rate Limiting: API throttling and brute-force protection
  • Security Headers: Helmet middleware with CORS configuration

Quality Assurance

  • TypeScript Strict Mode: Maximum type safety across all layers
  • Zero-Error Guarantee: All verification checks must pass
  • Database Integrity: Migrations, seeds, and transaction support
  • API Documentation: Swagger with authentication examples
  • Docker Ready: Multi-stage Dockerfile with PostgreSQL compose
  • Enterprise Standards: Complete production deployment pipeline

📊 Success Metrics

Setup Reliability: Mandatory web verification ensures compatible NestJS ecosystem
Architecture Quality: Hexagonal design with proper layer separation enforced
Security Standards: Complete authentication, RBAC, validation, rate limiting
Database Integration: Migrations, transactions, repository pattern implemented
Production Verification: API endpoints tested, Docker deployment verified

🔄 API Verification Commands

Development Verification 

npm run start:dev     # Development server on port 3000
npm run build         # Production build succeeds
npm run test          # Unit tests pass
npm run test:e2e      # E2E tests pass
npm run lint          # Zero ESLint errors

API Endpoint Testing 

curl http://localhost:3000/health              # Health check
curl http://localhost:3000/api                 # Swagger docs
curl -X POST http://localhost:3000/auth/login  # Authentication
curl -H "Authorization: Bearer <token>" \
     http://localhost:3000/users               # Protected endpoint

Database Verification 

npm run migration:run    # Database migrations
npm run seed:run        # Seed data execution
docker-compose up -d    # Container deployment

Enterprise backend assistant using structured prompt engineering to generate production-ready NestJS APIs with hexagonal architecture, complete authentication, and guaranteed verification.