# Schemas

Neutron uses [Zod](https://zod.dev/) to validate the frontmatter of your content files. This ensures your content matches your expected shape and provides TypeScript types for your data.

## Common Validators

```ts
import { z } from "@neutron-build/core/content";

// Strings
z.string()
z.string().email()
z.string().url()

// Numbers
z.number()
z.number().min(1)

// Dates
z.date()

// Arrays
z.array(z.string())

// Enums
z.enum(["red", "green", "blue"])

// Relation (reference to another collection entry)
// (Future feature)
```

## Build Errors

If a content file does not match the schema, `neutron-ts build` will fail with a helpful error message pointing to the specific file and field that is invalid. This prevents broken pages from ever reaching production.