zod-v4

Provide reference and guidance for building and validating Zod v4 schemas.

7|4|Updated Mar 2, 2026
One-click install
npx skills add https://github.com/nklisch/skills --skill zod-v4-nklisch
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: zod-v4
Source: https://github.com/nklisch/skills/tree/main/.agents/skills/zod-v4
Command: npx skills add https://github.com/nklisch/skills --skill zod-v4-nklisch

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Provides a concise, actionable reference for developers who need to design, validate, transform, and handle errors for Zod v4 schemas, reducing time spent searching docs and preventing common validation mistakes.

Core Features & Use Cases

  • API Reference: Summarizes core types, parsing methods, coercion helpers, collection and object utilities, and discriminated unions.
  • Patterns & Best Practices: Shows schema-first workflows, adapter functions for untrusted input, form validation patterns, and performance recommendations.
  • Migration & Gotchas: Documents breaking changes from v3 to v4, optional vs nullable differences, error customization, and common anti-patterns.
  • Use Cases: Validating API responses, parsing environment variables, form input validation, and deriving TypeScript types from schemas.

Quick Start

Ask the skill to produce a Zod v4 schema to validate an API response and return either parsed data or a formatted list of validation issues.

Frequently Asked Questions about zod-v4

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate an API response using Zod v4 in TypeScript?▼

To validate an API response using Zod v4, define a schema with core types and parsing methods, then parse the untrusted input to return either formatted data or a list of validation issues.

What are the breaking changes when migrating from Zod v3 to v4?▼

Migrating from Zod v3 to v4 involves handling breaking changes in optional vs nullable differences, error customization, and common anti-patterns to ensure schema validation logic remains compatible.

How does error handling work for Zod v4 schema parsing?▼

Error handling in Zod v4 schema parsing involves customizing validation issues and formatting error lists, allowing developers to catch and display input parsing errors for forms and API responses.

Can I derive TypeScript types directly from Zod v4 schemas?▼

Yes, you can derive TypeScript types directly from Zod v4 schemas using schema-first workflows, ensuring your TypeScript and JavaScript projects have type-safe parsing for untrusted input.

What is the best way to parse environment variables with Zod v4?▼

The best way to parse environment variables with Zod v4 is applying schema-first workflows and adapter functions to validate untrusted input, returning safely parsed configuration data.

Why does Zod v4 distinguish between optional and nullable fields?▼

Zod v4 distinguishes between optional and nullable fields to clarify validation rules for undefined versus null values, preventing common validation mistakes during input parsing and schema manipulation.