tanstack-form

The tanstack-form skill documents TanStack Form, a headless, performant, and type-safe form state management library that works across TS/JS frameworks including React, Vue, Angular, Solid, Lit, and Svelte. It handles form state, validation, and reactivity with deep TypeScript integration and without imposing any UI.

It covers the core useForm hook, the form.Field component with dot-notation nested fields, validation timing (onChange, onBlur, onSubmit, onMount), synchronous and debounced asynchronous validation, schema validation via Zod and Valibot adapters, form-level and linked/dependent field validation, array fields with their mutation methods (push, insert, replace, remove, swap, move), side-effect listeners, fine-grained reactivity through form.Subscribe and useStore, and the full form and field state shapes plus FormApi methods.

It is most useful for frontend developers building typed, validated forms, from simple inputs to dynamic array and dependent-field forms, who want fine-grained reactivity and schema-adapter support.