1. The Hidden Cost of Untyped JavaScript
In fast-moving startup environments, API response shapes evolve rapidly. Without static type checking, a minor database column rename can silently break checkout flows across multiple pages.
- Instant IDE auto-completion and compile-time error detection.
- Shared type contracts between frontend Next.js and backend API routes with Zod.
- Reduces automated testing boilerplate by catching trivial type mismatches.
