zod

Derive TypeScript types from Zod 4 schemas and parse inputs instead of casting.

1|Updated Apr 26, 2026

Search Tags:#typescript #validation #schema #zod #parse #defineComponent #infer

Ready to run

npx skills add https://github.com/matthewharwood/dean-stack --skill zod-matthewharwood

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: zod
Source: https://github.com/matthewharwood/dean-stack/tree/main/.claude/skills/zod
Command: npx skills add https://github.com/matthewharwood/dean-stack --skill zod-matthewharwood

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Zod 4 schema authoring for dean-stack enforces deriving TypeScript types from schemas and parsing inputs rather than casting, ensuring safer code and consistent validation across the codebase.

Core Features & Use Cases

Centralizes schema authoring with z.object, z.infer, parse and safeParse usage, along with a dev-only defineComponent wrapper to enable production tree-shaking.
Supports diagnosing ZodError in the browser and deriving TypeScript types for props, IDB records, env vars, and route parameters.

Quick Start

Create a z.object schema for a component's props and wrap it with defineComponent so the runtime parse check is tree-shaken in production.

Frequently Asked Questions about zod

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

FAQPage Schema

How do I derive TypeScript types from zod schemas instead of casting?▼

To derive TypeScript types from zod schemas, use z.infer on your z.object definition and parse inputs at runtime. This resolves the type-check gap by ensuring your TypeScript types match your validation logic without unsafe casting.

What is the best way to validate component props and environment variables in TypeScript?▼

The best way to validate component props and environment variables is authoring a z.object schema and applying z.infer. Parsing inputs with safeParse surfaces validation failures in development before they cause runtime errors.

How do I prevent runtime schema validation from increasing my production bundle size?▼

To prevent runtime schema validation from increasing production bundle size, wrap your component props with a dev-only defineComponent wrapper. This enables production tree-shaking, stripping the runtime parse checks from the final build.

How does safeParse handle invalid data when parsing IDB records?▼

When parsing IDB records, safeParse handles invalid data by returning a result object containing the ZodError details instead of throwing. This allows you to diagnose validation failures in the browser safely without crashing the application.

Does zod 4 support transforming route parameters before type inference?▼

Yes, zod 4 supports transforming route parameters before type inference. You can define transforms within your z.object schema and use z.infer to derive the resulting TypeScript type, ensuring parsed route data is both valid and correctly typed.

Why do my TypeScript types mismatch when parsing inputs instead of casting?▼

TypeScript types mismatch when casting because casting bypasses runtime validation. By defining a z.object schema and using z.infer, you enforce that your TypeScript types are structurally derived from your actual runtime parse checks.