2 posts tagged with "database schema single source of truth"

A user submits a form. Your TypeScript compiles clean. Your Zod validator passes. Your tRPC procedure returns a 200. And somewhere in the response, a column that was supposed to be Date | null arrives as an ISO string — and your frontend renders NaN where a timestamp should be.

You've seen this bug. You've shipped this bug. The type system didn't catch it because the type was never derived from the database in the first place — it was written by hand, approximately correct, and silently wrong.

This is the source-of-truth problem. TypeScript doesn't solve it. Where you define your data model does.

A common frustration in backend development: you've designed a schema in one context (a diagramming tool, a migration file, a Prisma schema), and now you need it in a different format for a different purpose. You end up maintaining multiple representations of the same model — and keeping them in sync manually.

TalkingSchema takes a different approach. The schema is defined once. Any export format is generated from that single source of truth, on demand, without touching the original.