migrating-v3-to-v4
Migrating to Zod v4
Purpose
Comprehensive guide for migrating existing Zod v3 codebases to v4, covering all breaking changes, migration patterns, and testing strategies.
Migration Overview
Zod v4 introduced major performance improvements and API refinements:
- 100x reduction in TypeScript instantiations
- 14x faster string parsing
- 57% smaller bundle size
- Simplified API surface with consistent patterns
Breaking changes are intentional improvements that require code updates.
Breaking Changes
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