Backend Fastify Stack (Bun)

High-performance backend stack, run on Bun:

• Bun - Runtime, package manager, test runner, and watch-mode dev server (no Node.js, npm, or tsx)
• Fastify 5.x - Web framework
• TypeScript - Type safety, executed directly by Bun (no build step for services)
• pino-pretty - Pretty logging for development
• @fastify/env - Environment variable validation with JSON Schema
• @fastify/cors - CORS support
• fastify-plugin - Plugin system

Bun runs TypeScript source directly, so there is no compile step in the dev loop and none in production for a service — you ship and run the source. tsc is kept only as a type checker (tsc --noEmit), never as a build tool.

Environment Setup

Use asdf to manage Bun: