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Headless, type-safe form state management built for building complex, high-performance forms without prescribing UI.

Designed around a core engine with a small, tree-shakeable footprint and a lightweight React adapter, it focuses on predictable state, minimal re-renders, and ergonomic APIs.

Validation is schema-agnostic and supports both sync and async flows, working seamlessly with Zod, Yup, Valibot, or custom validators. It handles cross-field rules, form-level validation, and field-level validators with fine-grained subscriptions.

Features include nested fields, field arrays, controlled and uncontrolled inputs, and powerful helpers for appending, inserting, removing, and reordering. Strong TypeScript support ensures end-to-end type safety and inference for form values, errors, and metadata.

Integrates with any UI component library, supports SSR-friendly patterns, and emphasizes DX through clear error messages and composable primitives.

Features

  • Headless form state management
  • Fine-grained subscriptions to minimize re-renders
  • Schema-agnostic validation (Zod, Yup, Valibot, custom)
  • Sync and async validation support
  • Cross-field and form-level validators
  • Nested fields and deep form structures
  • Field arrays with append/insert/remove/reorder helpers
  • TypeScript-first with strong type inference
  • Works with controlled and uncontrolled inputs
  • Composable field, form, and array APIs
  • Reset, submit, and lifecycle hooks
  • Integrates with any UI component library
  • Small, tree-shakeable core
  • React adapter for seamless usage

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