Using Zod for API input validation in Next.js

Short summary

A tutorial showing how to replace manual API input validation with Zod schemas in Next.js applications. Zod provides both runtime validation and automatically inferred TypeScript types from a single schema definition. The post covers safeParse for error handling, server action validation, and common schema patterns for strings, numbers, and schema composition.

• •Zod gives runtime validation and TypeScript types from one schema definition
• •safeParse returns a result object instead of throwing, ideal for API error handling
• •Covers route handlers, server actions, and schema composition (partial, pick, omit, extend)

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