Introduction ... Using Zod, you can define schemas you can use to validate data, from a simple string to a complex nested object.

Zod 4 release notes and new features including performance improvements and breaking changes

For complete documentation on Zod's schema API, refer to Defining schemas. Defining a schema ... Zod Zod Mini

In Zod 3, when the results were unmergable, Zod threw a ZodError with a special "invalid_intersection_types" issue. In Zod 4, this will throw a regular Error instead.

In other cases, you may have a set of Zod schemas you'd like to represent using multiple interlinked JSON Schemas, perhaps to write to .json files and serve from a web server.

The zod/v4 package is the "flagship" library of the Zod ecosystem. ... If you have uncommonly strict constraints around bundle size, consider Zod Mini.

Complete API reference for all Zod schema types, methods, and validation features

Overview of the Zod ecosystem including integrations, tools, and community resources

Zod Mini implements the exact same functionality as zod, but using a functional, tree-shakable API. If you're coming from zod, this means you generally will use functions in place of methods.

To avoid unexpected errors in your custom .refine() logic, Zod performs two "passes" during z.encode(). The first pass ensures the input type conforms to the expected type (no …