How to keep FastAPI and Next.js types synced (without leaking your database schema)

Let's talk about the "full-stack boundary." If you're building a modern web app with a Python backend (FastAPI) and a TypeScript frontend (Next.js/React), you know the pain: keeping your types in sync. You add a new field to a Pydantic model, you deploy, and ten minutes later your frontend crashes because the Zod validation schema wasn't updated. It's a manual, error-prone process. The Problem with "Online Converters" The usual move is to Google "Pydantic to Zod," click a link, and paste your co