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zod-pro
Validate with Zod: schemas, coercion, transforms, discriminated unions, and shared client/server contracts. Use when runtime validation and type inference matter.
skills/zod-pro/SKILL.md
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# Zod Pro
A practical guide to Zod: schema-first TypeScript — runtime validation with static type inference, coercion, transforms, discriminated unions, and sharing one schema between client, server, and forms.
## Overview
Zod lets you declare a schema once and get **both** runtime validation and a TypeScript type (`z.infer`). This kills the most common API bug class: "the type said X but the runtime sent Y." Schemas validate API responses, form input, env vars, and config — anywhere untrusted data crosses a boundary.
## When to use
- Validating API request/response payloads (tRPC, REST, webhooks).
- Form validation (with React Hook Form's zodResolver).
- Environment variable and config validation at startup (fail fast on bad config).
- Discriminated unions: event types, polymorphic API responses.