tanstack-form

Original：🇺🇸 English

Translated

TanStack Form best practices for type-safe form management, validation, field composition, and submission handling in React. Use when building forms with complex validation, integrating schema libraries (Zod/Valibot/ArkType), composing reusable form components, managing array/dynamic fields, or integrating with meta-frameworks (TanStack Start, Next.js, Remix).

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Sourcefellipeutaka/leon

Added on2026-02-21

NPX Install

npx skill4agent add fellipeutaka/leon tanstack-form

SKILL.md Content

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TanStack Form

Version: @tanstack/react-form@latest Requires: React 18.0+, TypeScript 5.0+

Quick Setup

bash

npm install @tanstack/react-form

tsx

import { useForm } from '@tanstack/react-form'

function App() {
  const form = useForm({
    defaultValues: {
      firstName: '',
      lastName: '',
    },
    onSubmit: async ({ value }) => {
      console.log(value)
    },
  })

  return (
    <form
      onSubmit={(e) => {
        e.preventDefault()
        e.stopPropagation()
        form.handleSubmit()
      }}
    >
      <form.Field
        name="firstName"
        validators={{
          onChange: ({ value }) =>
            !value ? 'Required' : value.length < 3 ? 'Too short' : undefined,
        }}
        children={(field) => (
          <>
            <input
              value={field.state.value}
              onBlur={field.handleBlur}
              onChange={(e) => field.handleChange(e.target.value)}
            />
            {!field.state.meta.isValid && (
              <em>{field.state.meta.errors.join(', ')}</em>
            )}
          </>
        )}
      />
      <form.Subscribe
        selector={(state) => [state.canSubmit, state.isSubmitting]}
        children={([canSubmit, isSubmitting]) => (
          <button type="submit" disabled={!canSubmit}>
            {isSubmitting ? '...' : 'Submit'}
          </button>
        )}
      />
    </form>
  )
}

Production Setup (Recommended)

For production apps, use

createFormHook

to pre-bind reusable UI components and reduce boilerplate:

tsx

import { createFormHookContexts, createFormHook } from '@tanstack/react-form'
import { TextField, NumberField, SubmitButton } from '~/ui-library'

const { fieldContext, formContext } = createFormHookContexts()

export const { useAppForm } = createFormHook({
  fieldComponents: { TextField, NumberField },
  formComponents: { SubmitButton },
  fieldContext,
  formContext,
})

Devtools

bash

npm install -D @tanstack/react-devtools @tanstack/react-form-devtools

tsx

import { TanStackDevtools } from '@tanstack/react-devtools'
import { formDevtoolsPlugin } from '@tanstack/react-form-devtools'

<TanStackDevtools
  config={{ hideUntilHover: true }}
  plugins={[formDevtoolsPlugin()]}
/>

Rule Categories

Priority	Category	Rule File	Impact
CRITICAL	Form Setup	`rules/form-setup.md`	Correct form creation and type inference
CRITICAL	Validation	`rules/val-validation.md`	Prevents invalid submissions and poor UX
CRITICAL	Schema Validation	`rules/val-schema-validation.md`	Type-safe validation with Zod/Valibot/ArkType
HIGH	Form Composition	`rules/comp-form-composition.md`	Reduces boilerplate, enables reusable components
HIGH	Field State	`rules/field-state.md`	Correct state access and reactivity
HIGH	Array Fields	`rules/arr-array-fields.md`	Dynamic list management
HIGH	Linked Fields	`rules/link-linked-fields.md`	Cross-field validation (e.g. confirm password)
MEDIUM	Listeners	`rules/listen-listeners.md`	Side effects on field events
MEDIUM	Submission	`rules/sub-submission.md`	Correct submit handling and meta passing
MEDIUM	SSR / Meta-Frameworks	`rules/ssr-meta-frameworks.md`	Server validation with Start/Next.js/Remix
LOW	UI Libraries	`rules/ui-libraries.md`	Headless integration with component libraries

Critical Rules

Always Do

Type from defaultValues — never pass generics to
```
useForm<T>()
```
, let TS infer from
```
defaultValues
```

Prevent default on submit —

e.preventDefault(); e.stopPropagation(); form.handleSubmit()

Use
children
render prop —

form.Field

uses render props via

children={(field) => ...}

Use
form.Subscribe
with selector — subscribe to specific state slices to avoid re-renders

Use
useStore
with selector —

useStore(form.store, (s) => s.values.name)

not

useStore(form.store)

Use
createFormHook
in production — pre-bind components for consistency and less boilerplate
Debounce async validators — set
```
onChangeAsyncDebounceMs
```
or
```
asyncDebounceMs
```

Never Do

Pass generics —
```
useForm<MyType>()
```
breaks the design; use typed
```
defaultValues
```
instead
Skip
e.preventDefault()
— native form submission will bypass TanStack Form's handling

Use
useField
for reactivity — use

useStore(form.store)

form.Subscribe

instead

Omit selector in
useStore
— causes full re-render on every state change
Use
type="reset"
without
e.preventDefault()
— native reset bypasses TanStack Form; use
```
form.reset()
```
explicitly
Expect transformed values in
onSubmit
— Standard Schema transforms aren't applied; parse manually in
```
onSubmit
```

Key Patterns

tsx

// Schema validation (form-level with Zod)
const form = useForm({
  defaultValues: { age: 0, name: '' },
  validators: {
    onChange: z.object({ age: z.number().min(13), name: z.string().min(1) }),
  },
  onSubmit: ({ value }) => console.log(value),
})

// Array fields
<form.Field name="hobbies" mode="array" children={(field) => (
  <div>
    {field.state.value.map((_, i) => (
      <form.Field key={i} name={`hobbies[${i}].name`} children={(sub) => (
        <input value={sub.state.value} onChange={(e) => sub.handleChange(e.target.value)} />
      )} />
    ))}
    <button type="button" onClick={() => field.pushValue({ name: '' })}>Add</button>
  </div>
)} />

// Linked fields (confirm password)
<form.Field name="confirm_password" validators={{
  onChangeListenTo: ['password'],
  onChange: ({ value, fieldApi }) =>
    value !== fieldApi.form.getFieldValue('password') ? 'Passwords do not match' : undefined,
}} children={(field) => <input value={field.state.value} onChange={(e) => field.handleChange(e.target.value)} />} />

// Listeners (reset province when country changes)
<form.Field name="country" listeners={{
  onChange: ({ value }) => { form.setFieldValue('province', '') },
}} children={(field) => <input value={field.state.value} onChange={(e) => field.handleChange(e.target.value)} />} />

// Form composition with withForm
const ChildForm = withForm({
  defaultValues: { firstName: '', lastName: '' },
  render: function Render({ form }) {
    return <form.AppField name="firstName" children={(field) => <field.TextField label="First Name" />} />
  },
})