zod-4

SKILL.md

Zod 4 schema validation patterns for forms, APIs, and type-safe parsing.

Covers breaking changes from Zod 3, including new top-level validators (z.email(), z.uuid(), z.url()) and updated object configuration syntax

Includes patterns for primitives, objects, arrays, records, tuples, unions, and discriminated unions with practical examples

Demonstrates transformations, coercion, preprocessing, refinements, and custom error handling with Zod 4's error parameter syntax

Provides React Hook Form integration example using zodResolver for form validation with type inference

Breaking Changes from Zod 3

// ❌ Zod 3 (OLD)
z.string().email()
z.string().uuid()
z.string().url()
z.string().nonempty()
z.object({ name: z.string() }).required_error("Required")

// ✅ Zod 4 (NEW)
z.email()
z.uuid()
z.url()
z.string().min(1)
z.object({ name: z.string() }, { error: "Required" })

Basic Schemas