zod▌

Zod 4 schema validation patterns for forms, APIs, and type-safe parsing. \n \n Covers breaking changes from Zod 3, including new top-level validators (z.email(), z.uuid(), z.url()) and updated object configuration syntax \n Includes patterns for primitives, objects, arrays, records, tuples, unions, and discriminated unions with practical examples \n Demonstrates transformations, coercion, preprocessing, refinements, and custom error handling with Zod 4's error parameter syntax \n Provides React

Production-ready Zod v4 patterns for reusable, type-safe validation with minimal boilerplate. Focuses on modern APIs, predictable error handling, and form integration.

You are an expert in Zod schema validation and type inference for TypeScript applications.

Status: Production Ready ✅ Last Updated: 2025-11-20 Dependencies: None (standalone) Latest Versions: react-hook-form@7.66.1, zod@4.1.12, @hookform/resolvers@5.2.2

TypeScript-first schema validation with automatic static type inference from runtime schemas. \n \n Define schemas once and automatically infer TypeScript types for compile-time safety; supports primitives, objects, arrays, unions, and recursive types \n Validate data with parse() (throws) or safeParse() (returns result object); includes async validation for database lookups and external checks \n Transform and refine data during validation using transform() , refine() , and superRefine() for cu

Schema validation best practices for TypeScript with 43 prioritized rules across type safety, parsing, and error handling. \n \n Covers 8 rule categories from schema definition and parsing (CRITICAL) through type inference, error handling, and performance (LOW-MEDIUM) \n Distinguishes safeParse() for user input, parseAsync() for async refinements, and parse() for trusted data; emphasizes validation at system boundaries \n Provides guidance on z.infer for type inference, z.unknown() over z.any(),

Type-safe validated forms with React Hook Form v7 and Zod v4, single schema for client and server. \n \n Combines uncontrolled registration with Zod schema validation and full TypeScript inference via z.infer ; supports dynamic fields, multi-step wizards, and conditional validation patterns \n Includes resolver setup, error handling, useFieldArray for dynamic lists, and Controller integration for third-party components \n Documents 20 known issues and workarounds, including large-form performanc

Zod is a TypeScript-first validation library that enables developers to define schemas for validating data at runtime while automatically inferring static TypeScript types. With zero dependencies and a 2kb core bundle (gzipped), Zod provides immutable, composable validation with comprehensive error handling.