Zod LLM Documentation

Zod provides comprehensive LLM-optimized documentation at https://zod.dev/llms.txt .

When to Use

Fetch this documentation when:

• Defining TypeScript-first schemas for data validation

• Working with Zod 4's new features (codecs, metadata, registries)

• Converting schemas to/from JSON Schema

• Customizing or formatting validation errors

• Integrating with form libraries or API validation

• Using Zod Mini for bundle size optimization

Key Topics Covered

• Schema Types: Primitives, Objects, Arrays, Unions, Records, Tuples

• String Validation: Email, UUID, URL, ISO datetime, IP addresses, JWT

• Transformations: Refinements, Transforms, Pipes, Codecs

• Error Handling: Custom errors, Formatting, Internationalization

• Advanced: Recursive objects, Discriminated unions, Branded types

• JSON Schema: Conversion, Metadata, Registries

Quick Reference

// Fetch Zod docs via Firecrawl const docs = await firecrawl.scrape({ url: "https://zod.dev/llms.txt", formats: ["markdown"] });

Common Schema Patterns

import { z } from "zod";

// Basic object schema const userSchema = z.object({ id: z.string().uuid(), email: z.string().email(), age: z.number().int().positive(), role: z.enum(["admin", "user"]), });

// Infer TypeScript type type User = z.infer<typeof userSchema>;

Zod 4 Features

Feature Description

Codecs Bidirectional encode/decode

Metadata Attach metadata to schemas

Registries Organize and reference schemas

Zod Mini Tree-shakable minimal build

JSON Schema Native conversion support

Related Skills

• effect-patterns

• Effect TypeScript (uses Zod-like Schema)

• better-auth

• Uses Zod for validation