What it is

The default TypeScript schema validator, v4 stable. You declare a schema once and get both runtime validation and a static type via z.infer. Around 2KB gzipped for the core, with a smaller zod/mini build for size-critical bundles.

Why it earns a slot

The seam where untrusted data — API responses, form input, env vars — becomes typed. TypeScript vanishes at runtime, so without a validator a malformed response becomes an undefined crash three components later.

Know before you commit

Zod 4 changed error-handling APIs and some method names from v3, so a v3 tutorial will not paste in cleanly. Very large schemas can slow TypeScript inference.

Getting started

npm install zod

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Pricing snapshot

Free · MIT

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Drop into your Lovable chat

Evaluate Zod (https://zod.dev) for this project, then use it only if it fits what we are already building.
Context: Schema validation. The default TypeScript schema validator, v4 stable. You declare a schema once and get both runtime validation and a static type via z.infer. Around 2KB gzipped for the core, with a smaller zod/mini build for size-critical bundles.
Reviewer notes (general, not written for this codebase): The seam where untrusted data — API responses, form input, env vars — becomes typed. TypeScript vanishes at runtime, so without a validator a malformed response becomes an undefined crash three components later.
Watch out for: Zod 4 changed error-handling APIs and some method names from v3, so a v3 tutorial will not paste in cleanly. Very large schemas can slow TypeScript inference.
Pricing: Free · MIT
Setup: npm install zod
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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