Zod is a TypeScript-first schema validation library that gives you a single source of truth for both runtime validation and static types. Define a schema once and get validation and type inference for free.
This showcase teaches how to use Zod v4 through interactive exercises, but first you should start by reading up on the ins and outs of using Zod from the links below:
The runtime problems TypeScript can't catch, shown as before/after comparisons.
Explore →Primitive types, objects, arrays, and optional/nullable fields. The building blocks every Zod user needs first.
Explore →Form validation, API response parsing, and environment variable validation tied to concrete dev scenarios.
Explore →Mistakes beginners make: .parse vs .safeParse, partial vs required, and type inference gotchas.
Explore →Schema composition, custom error messages, and separating schema definitions from TypeScript types.
Explore →OpenAPI generators, monitoring integrations, and tools that extend Zod across your entire stack.
Explore →You can also read more about Zod and its features in the official documentation: zod.dev.
This course logs anonymous usage data to improve future versions. Including which exercises you complete, which pages you read, and the JSON and schema inputs you type in the exercises. No account is required and nothing is tied to your identity. A random ID is stored in your browser for this purpose.
Version 1.10.0