Zod 3 Validation Guidelines

Type-safe schemas for data validation in TypeScript are defined using Zod to specify primitives, objects, arrays, unions, and enums. This approach ensures data integrity by catching invalid structures at runtime and inferring TypeScript types automatically.

The best way to validate user input with Zod in React Hook Form is by integrating a defined Zod schema using a resolver. This pattern automatically validates frontend form data against the schema, preventing invalid user input from being submitted.

Zod can be used for data validation in Next.js Server Actions by parsing the incoming form data against a defined schema. This integration pattern ensures that server-side actions receive strictly validated, type-safe data before processing.

Custom validations and data transformations using Zod are implemented through schema methods that allow you to define specific constraints and modify parsed data. You can apply default values, transform structures, and create reusable validation logic for complex data types.

Zod supports schema definitions for complex types including enums, unions, objects, and arrays. This allows you to model highly structured and varied data formats, ensuring comprehensive type safety and data integrity across your TypeScript applications.