zod

Validate API inputs and data structures using Zod 4 schemas.

1|Updated Jan 12, 2026
One-click install
npx skills add https://github.com/JosephAnson/claude-plugin --skill zod-josephanson
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: zod
Source: https://github.com/JosephAnson/claude-plugin/tree/main/skills/zod
Command: npx skills add https://github.com/JosephAnson/claude-plugin --skill zod-josephanson

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Zod 4 validation patterns and conventions for robust data validation across applications, helping teams ensure inputs conform to defined schemas and catch errors early.

Core Features & Use Cases

  • ISO date/time validation with z.iso.* helpers for accurate date handling
  • UUID and string pattern validation with z.uuid() and related validators
  • Migration guidance from Zod 3 to Zod 4, including API route integration and error messaging
  • Local and shared schema usage in API routes and service layers for consistent validation
  • Example schemas and route validations across common API patterns

Quick Start

Create a small Zod 4 schema for a sample user payload and validate a mock API request.

Frequently Asked Questions about zod

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

FAQPage Schema
How do I validate API inputs with Zod 4 schemas in TypeScript?

To validate API inputs with Zod 4, define TypeScript schemas and apply them to incoming API route requests, ensuring payloads match expected types and generating clear error messages for invalid data.

How do I handle ISO date validation using Zod 4?

ISO date validation in Zod 4 uses the z.iso.* helpers for accurate date and time handling. These helpers ensure that ISO date strings conform to correct formatting before they reach your service layer.

How do I migrate API route validation from Zod 3 to Zod 4?

Migrating from Zod 3 to Zod 4 requires updating schema definitions and error messaging using the provided migration guidance, ensuring TypeScript validation patterns transition smoothly without breaking API input checks.

Does Zod 4 support UUID pattern validation for API payloads?

Yes, Zod 4 supports UUID pattern validation through z.uuid() and related string validators, allowing strict validation of UUID formats and other string patterns within API input schemas.

What is the best way to structure Zod 4 schemas for API routes and service layers?

Use local schemas for specific API route validation and shared schemas across the service layer, ensuring consistent validation patterns and robust data conformity across your TypeScript application.

Why are my Zod 4 schema validation errors not returning useful API messages?

Zod 4 schema validation errors may lack useful API messages if error handling is not properly configured during route validation; applying concrete Zod 4 error messaging patterns ensures robust feedback for invalid inputs.