Can it handle complex data structures like self-referencing objects?

Yes, it includes specific technical patterns for recursive objects using getters and discriminated unions for complex conditional logic.

Does it provide guidance on where to store schema files?

Yes, it defines a clear placement convention, such as storing server schemas in src/server/schemas/ and environment schemas in src/env.ts.

How does it handle validation error messages?

It enforces a rule against hardcoding strings in schemas, instead recommending a centralized ERROR_MESSAGES constant for better maintainability and localization.

What version of Zod does this skill support?

This skill is specifically designed for Zod 4, emphasizing its modern top-level functions like z.email() and z.url() over deprecated method chains.

Does this skill include client-side validation rules?

While Zod can be used on the client, this skill primarily focuses on server-side schema organization, directory structures, and Server Actions integration.

Zod 4 Validation Standards

Name: Zod 4 Validation Standards
Author: shoma-endo

byshoma-endo

API Development

Standardizes Zod 4 validation implementations with consistent schema definitions, type safety, and robust error handling patterns.

About

This skill provides a comprehensive framework for implementing Zod 4 validation in modern TypeScript applications, specifically tailored for projects using Next.js and Server Actions. It enforces best practices for schema organization across server and environment layers, leverages Zod 4's modern top-level functions, and provides standardized patterns for error handling and type derivation. By centralizing validation logic and discouraging anti-patterns like hardcoded error strings, it helps developers build maintainable, type-safe, and secure backends.

Key Features

Standardized schema organization for server, environment, and inline contexts
Pre-defined integration patterns for Next.js Server Actions and safeParse
Unified error handling via centralized ERROR_MESSAGES constants
Optimized Zod 4 syntax patterns including top-level functions and metadata
Advanced support for recursive objects and discriminated unions
0 GitHub stars

Use Cases

Refactoring legacy Zod codebases to comply with modern Zod 4 best practices
Standardizing validation logic across large-scale TypeScript development teams
Implementing type-safe API request parsing and form validation in Next.js

About

Key Features

Standardized schema organization for server, environment, and inline contexts
Pre-defined integration patterns for Next.js Server Actions and safeParse
Unified error handling via centralized ERROR_MESSAGES constants
Optimized Zod 4 syntax patterns including top-level functions and metadata
Advanced support for recursive objects and discriminated unions
0 GitHub stars

Use Cases

Refactoring legacy Zod codebases to comply with modern Zod 4 best practices
Standardizing validation logic across large-scale TypeScript development teams
Implementing type-safe API request parsing and form validation in Next.js