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.
Each example below lets you edit the JSON input and see the result live in your browser. No setup required.
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 →Interactive exercises that let you edit JSON inputs and see live validation results in your browser.
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