# Overview

TanStack Form is the ultimate solution for handling forms in web applications, providing a powerful and flexible approach to form management. Designed with first-class TypeScript support, headless UI components, and a framework-agnostic design, it streamlines form handling and ensures a seamless experience across various front-end frameworks.

## Motivation

Most web frameworks do not offer a comprehensive solution for form handling, leaving developers to create their own custom implementations or rely on less-capable libraries. This often results in a lack of consistency, poor performance, and increased development time. TanStack Form aims to address these challenges by providing an all-in-one solution for managing forms that is both powerful and easy to use.

With TanStack Form, developers can tackle common form-related challenges such as:

- Reactive data binding and state management
- Complex validation and error handling
- Accessibility and responsive design
- Internationalization and localization
- Cross-platform compatibility and custom styling

By providing a complete solution for these challenges, TanStack Form empowers developers to build robust and user-friendly forms with ease.

## Enough talk, show me some code already!

In the example below, you can see TanStack Form in action with the Preact framework adapter:

[Open in CodeSandbox](https://codesandbox.io/s/github/tanstack/form/tree/alpha/examples/preact/simple)

<!-- ::start:tabs variant="files" -->

```tsx title="App.tsx"
import { render } from 'preact'
import { useForm } from '@tanstack/preact-form'

import { FieldInfo } from './FieldInfo.tsx'

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

  return (
    <div>
      <h1>Simple Form Example</h1>
      <form
        onSubmit={(event) => {
          event.preventDefault()
          event.stopPropagation()
          void form.handleSubmit()
        }}
      >
        <div>
          <form.Field
            name="firstName"
            validators={[
              {
                run: ({ value }) =>
                  !value
                    ? 'A first name is required'
                    : value.length < 3
                      ? 'First name must be at least 3 characters'
                      : undefined,
                triggers: ['change'],
              },
              {
                run: async ({ value }) => {
                  await new Promise((resolve) => setTimeout(resolve, 1000))
                  return (
                    value.includes('error') &&
                    'No "error" allowed in first name'
                  )
                },
                triggers: ['change'],
                triggerDebounceMs: 500,
              },
            ]}
          >
            {(field) => (
              <>
                <label htmlFor={field.name}>First Name:</label>
                <input
                  id={field.name}
                  name={field.name}
                  value={field.value}
                  onBlur={field.handleBlur}
                  onInput={(event) =>
                    field.handleChange(event.currentTarget.value)
                  }
                  aria-invalid={field.meta.isInvalid}
                />
                <FieldInfo field={field} />
              </>
            )}
          </form.Field>
        </div>
        <div>
          <form.Field name="lastName">
            {(field) => (
              <>
                <label htmlFor={field.name}>Last Name:</label>
                <input
                  id={field.name}
                  name={field.name}
                  value={field.value}
                  onBlur={field.handleBlur}
                  onInput={(event) =>
                    field.handleChange(event.currentTarget.value)
                  }
                  aria-invalid={field.meta.isInvalid}
                />
                <FieldInfo field={field} />
              </>
            )}
          </form.Field>
        </div>
        <form.Subscribe
          selector={(state) => [state.canSubmit, state.isSubmitting]}
        >
          {([canSubmit, isSubmitting]) => (
            <>
              <button type="submit" disabled={!canSubmit || isSubmitting}>
                {isSubmitting ? '...' : 'Submit'}
              </button>
              <button
                type="reset"
                onClick={(event) => {
                  event.preventDefault()
                  form.reset()
                }}
              >
                Reset
              </button>
            </>
          )}
        </form.Subscribe>
      </form>
    </div>
  )
}

render(<App />, document.getElementById('root')!)
```

```tsx title="FieldInfo.tsx"
import type { AnyFieldApi } from '@tanstack/preact-form'

export function FieldInfo({ field }: { field: AnyFieldApi }) {
  return (
    <>
      {field.meta.isTouched && field.meta.isInvalid ? (
        <em role="alert">
          {field.errors.map((error) => error.message).join(', ')}
        </em>
      ) : null}
      {field.meta.isValidating ? 'Validating...' : null}
    </>
  )
}
```

<!-- ::end:tabs -->

> Other framework adapters are coming soon and are already supported in the stable version of TanStack Form.

## You talked me into it, so what now?

- Learn TanStack Form at your own pace with our thorough [Walkthrough Guide](./installation) and [API Reference](./reference/interfaces/FormApi).