TanStack Start + Elysia + Better Auth Template

A full-stack monorepo template showcasing the power of modern web development with end-to-end type safety, blazing performance, and seamless authentication.

🚀 Motivation

This project was inspired by Indra Zulfi Mushoddaq's post about the incredible developer experience of Elysia + Eden + Better Auth combination. After trying it out, I can confirm that this stack is absolutely GOAT (Greatest Of All Time):

✅ Auto-generated docs - No more manual API documentation headaches
✅ E2E Type Safety - Thanks to Eden Client + Better Auth Client
✅ Performance fast AF - Even faster than server functions from Remix, Next.js, or TanStack Start
✅ Auth setup made easy - From Social Sign-In to email+password (Indonesian favorite +62)

The SSR works smoothly and is surprisingly easier to configure than Remix and Start.

🏗️ What's inside?

This monorepo includes the following packages/apps:

Apps and Packages

• backend: Elysia.js API server with Better Auth
• web: TanStack Start frontend with SSR
• packages/db: Drizzle ORM with SQLite/Turso database
• packages/backend-client: Type-safe API client using Eden Treaty
• tooling/*: Shared configurations (ESLint, Prettier, TypeScript, Tailwind)

Tech Stack

• Frontend: TanStack Start, TanStack Query, Jotai, shadcn/ui
• Backend: Elysia.js, Better Auth, Swagger docs
• Database: Drizzle ORM, SQLite/Turso
• Runtime: Bun
• Styling: Tailwind CSS
• Type Safety: End-to-end with Eden Treaty

Getting Started

To install and start developing all apps, run the following command:

bun install
bun dev

Development Scripts

# Type check all packages
bun typecheck

# Format all packages
bun format
bun format:fix

# Lint all packages
bun lint
bun lint:fix

# Database operations
bun db:generate    # Generate migrations
bun db:push       # Push schema to database
bun db:seed       # Seed database with sample data
bun db:studio     # Open Drizzle Studio

# Build and clean
bun build         # Build all packages
bun clean         # Clean all artifacts

🏛️ Architecture

This template follows clean architecture principles with feature-based organization:

Monorepo Structure

apps/
├── backend/          # Elysia.js API server
└── web/              # TanStack Start frontend
packages/
├── backend-client/   # Type-safe API client (Eden Treaty)
└── db/              # Drizzle ORM schemas and migrations
tooling/             # Shared configs (ESLint, Prettier, TypeScript, Tailwind)

Key Features Implemented

• 🔐 Authentication: Complete flow with Better Auth (email/password + social)
• 📊 Count Demo: File-based persistence example
• 💬 Messages: Full CRUD operations with database
• 🎮 Pokemon: External API integration with caching
• 📚 Auto Docs: Swagger documentation generation
• 🔄 SSR: Server-side rendering with TanStack Start

🌟 What Makes This Stack Special

1. End-to-End Type Safety: From database to frontend, everything is typed
2. Performance: Bun runtime + Elysia performance + TanStack optimizations
3. Developer Experience: Hot reload, auto-completion, built-in docs
4. Modern Patterns: Clean architecture, repository pattern, feature organization
5. Production Ready: Auth, database, error handling, and deployment ready

🤝 Contributing

This is a demonstration template, but feel free to:

• Open issues for bugs or suggestions
• Submit PRs for improvements
• Use this as a starting point for your projects

🙏 Acknowledgments

• Thanks to Indra Zulfi Mushoddaq for the inspiration
• The amazing teams behind Elysia, TanStack, and Better Auth
• The TypeScript and Bun communities

Sorry for messy code 🙃, but if you have suggestions, feel free to share!

Want to discuss minimal features or UI improvements? Drop a comment in the discussions! 🚀