Schema Form Validation

Use the existing useForm.validate callback with a shared TypeBox schema:

import { Type, type Static } from '@sinclair/typebox';
import { createSchemaFormValidator, useForm } from '@svadmin/core';

const Input = Type.Object({
  title: Type.String({ minLength: 1 }),
  quantity: Type.Integer({ minimum: 1 }),
});
type Input = Static<typeof Input>;

const form = useForm({
  resource: 'items',
  defaultValues: { title: '', quantity: 1 } satisfies Input,
  validate: createSchemaFormValidator(Input, {
    message: ({ path }) => path === '/quantity' ? 'Enter a positive integer' : 'Required',
  }),
});

Validation does not coerce or strip input. It returns null on success or the first error per field. JSON Pointer paths map to dotted fields (items.0.name); root errors map to _form. Use field(pointer) and formField when an application uses another naming convention. references supports TypeBox refs. Message callbacks receive only the path and error type, not submitted values.

This adapter prevents invalid form submissions through normal useForm validation. Authorization, domain commands, and server validation remain the application's responsibility. Root errors require a form-level error display.