alan345/AI-Fullstack-SaaS-Boilerplate

Fullstack SaaS Boilerplate built with tRPC, Fastify and React

What it solves

It provides a production-ready starting point for developers who want to build AI-powered SaaS applications without spending time on repetitive setup tasks like authentication, database configuration, and API plumbing.

How it works

The project is a full-stack monorepo that integrates a modern TypeScript stack. It uses Fastify for the backend server, React 19 for the frontend, and tRPC to ensure end-to-end type safety between the client and server. It incorporates OpenAI's API for AI capabilities and implements Server-Sent Events (SSE) to handle real-time AI chat streaming without the complexity of WebSockets.

Who it’s for

Developers building web applications (rather than SEO-focused websites) who prioritize developer experience, type safety, and a fast path to deploying an AI-enabled service.

Highlights

  • End-to-end Type Safety: Uses tRPC to synchronize types between the frontend and backend.
  • AI Chat Integration: Built-in support for OpenAI and streaming responses via SSE.
  • Modern Stack: Combines Fastify, Drizzle ORM, Postgres, and Tailwind CSS v4.
  • Static Frontend: Designed so the frontend can be hosted as static files (e.g., on AWS S3) rather than relying on a Next.js server.

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