AI code generator that does NestJS and FastAPI — pick the stack, keep the architecture

NestJS vs FastAPI — when to pick which

| Factor | NestJS + Next.js | FastAPI + Next.js | |---|---|---| | Team skills | TypeScript full-stack | Python ML/data teams | | API style | Decorators, modules, DI | Async-first, Pydantic native | | OpenAPI | Generated via Nest swagger | Native FastAPI OpenAPI | | Enterprise buyers | Common in EU/US B2B | Common in AI/ML SaaS | | Archiet genome source | Identical blueprint | Identical blueprint |

What both stacks include

• JWT auth in httpOnly cookies (not localStorage)
• Multi-tenant workspace_id / organization_id filters on data access
• CRUD + search endpoints per entity in PRD
• Next.js frontend with shadcn — auth, settings, onboarding, forgot-password
• docker-compose.yml (API + Postgres + Redis when needed)
• openapi.yaml at repo root
• ADRs documenting ORM, auth, and deployment choices

Side-by-side output shape

| Artifact | NestJS ZIP | FastAPI ZIP | |---|---|---| | Entry | src/main.ts | app/main.py | | Models | TypeORM / Prisma entities | SQLAlchemy models | | Migrations | Stack-native | Alembic revisions | | Tests | Jest e2e scaffolds | pytest + httpx | | Frontend | frontend/ Next.js | frontend/ Next.js (same manifest) |

CTA

One PRD. NestJS or FastAPI — your call. archiet.com/stacks/nestjs · archiet.com/stacks/fastapi · Register free

FAQ

Can I generate both and diff them?

Yes. Same blueprint, two generation jobs — useful for stack selection workshops.

Does NestJS output include guards and pipes?

Yes — auth guards, validation pipes, and module boundaries per entity domain.

FastAPI async — is sync code mixed in?

Templates follow async route handlers where the stack emitter targets async I/O patterns.