TanStack Form Validation and Errors

Use this skill when the task is about how TanStack Form should validate data or expose validation results.

Scope

• field-level vs form-level validators
• onMount, onChange, onBlur, onSubmit, and dynamic validation timing
• sync plus async validator behavior and debounce
• Standard Schema validation with Zod, Valibot, ArkType, Effect/Schema, and similar libraries
• custom error payloads and disableErrorFlat

Routing cues

• validators, onChangeAsync, asyncAlways, revalidateLogic, onDynamic, disableErrorFlat, errorMap, form-level field errors, schema validation, or typed custom errors -> this skill
• arrays, linked fields, form.Subscribe, useStore, or listeners -> tanstack-form-dynamic-fields-and-reactivity
• transformed schema output in onSubmit, submit metadata, or submit-invalid focus flows -> tanstack-form-data-loading-and-submission-ux
• createFormHook, withForm, or UI-library wrappers -> tanstack-form-composition-and-ui-integration