Zod Firestore Type Safety

Overview

Firestore is schemaless, creating a mismatch with TypeScript's compile-time types. Zod bridges this gap by providing runtime validation at the application boundary, ensuring data integrity.

Core Pattern: Zod + withConverter

The Atomic Unit

Every Firestore collection requires three components:

1. Zod Schema: Runtime validation definition
2. TypeScript Type: Inferred from Zod schema
3. Converters: Client and server withConverter objects