📄 tanstack/form/latest/docs/framework/react/examples/simple
File: simple.md | Updated: 11/15/2025
Source: https://tanstack.com/form/latest/docs/framework/react/examples/simple
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React Example: Simple
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public
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src
index.tsx
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.eslintrc.cjs
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.gitignore
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README.md
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index.html
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package.json
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tsconfig.json
tsx
import * as React from 'react'
import { createRoot } from 'react-dom/client'
import { TanStackDevtools } from '@tanstack/react-devtools'
import { formDevtoolsPlugin } from '@tanstack/react-form-devtools'
import { useForm } from '@tanstack/react-form'
import type { AnyFieldApi } from '@tanstack/react-form'
function FieldInfo({ field }: { field: AnyFieldApi }) {
return (
<>
{field.state.meta.isTouched && !field.state.meta.isValid ? (
<em>{field.state.meta.errors.join(',')}</em>
) : null}
{field.state.meta.isValidating ? 'Validating...' : null}
</>
)
}
export default function App() {
const form = useForm({
defaultValues: {
firstName: '',
lastName: '',
},
onSubmit: async ({ value }) => {
// Do something with form data
console.log(value)
},
})
return (
<div>
<h1>Simple Form Example</h1>
<form
onSubmit={(e) => {
e.preventDefault()
e.stopPropagation()
form.handleSubmit()
}}
>
<div>
{/* A type-safe field component*/}
<form.Field
name="firstName"
validators={{
onChange: ({ value }) =>
!value
? 'A first name is required'
: value.length < 3
? 'First name must be at least 3 characters'
: undefined,
onChangeAsyncDebounceMs: 500,
onChangeAsync: async ({ value }) => {
await new Promise((resolve) => setTimeout(resolve, 1000))
return (
value.includes('error') && 'No "error" allowed in first name'
)
},
}}
children={(field) => {
// Avoid hasty abstractions. Render props are great!
return (
<>
<label htmlFor={field.name}>First Name:</label>
<input
id={field.name}
name={field.name}
value={field.state.value}
onBlur={field.handleBlur}
onChange={(e) => field.handleChange(e.target.value)}
/>
<FieldInfo field={field} />
</>
)
}}
/>
</div>
<div>
<form.Field
name="lastName"
children={(field) => (
<>
<label htmlFor={field.name}>Last Name:</label>
<input
id={field.name}
name={field.name}
value={field.state.value}
onBlur={field.handleBlur}
onChange={(e) => field.handleChange(e.target.value)}
/>
<FieldInfo field={field} />
</>
)}
/>
</div>
<form.Subscribe
selector={(state) => [state.canSubmit, state.isSubmitting]}
children={([canSubmit, isSubmitting]) => (
<>
<button type="submit" disabled={!canSubmit}>
{isSubmitting ? '...' : 'Submit'}
</button>
<button
type="reset"
onClick={(e) => {
// Avoid unexpected resets of form elements (especially <select> elements)
e.preventDefault()
form.reset()
}}
>
Reset
</button>
</>
)}
/>
</form>
</div>
)
}
const rootElement = document.getElementById('root')!
createRoot(rootElement).render(
<React.StrictMode>
<App />
<TanStackDevtools
config={{ hideUntilHover: true }}
plugins={[formDevtoolsPlugin()]}
/>
</React.StrictMode>,
)
import * as React from 'react'
import { createRoot } from 'react-dom/client'
import { TanStackDevtools } from '@tanstack/react-devtools'
import { formDevtoolsPlugin } from '@tanstack/react-form-devtools'
import { useForm } from '@tanstack/react-form'
import type { AnyFieldApi } from '@tanstack/react-form'
function FieldInfo({ field }: { field: AnyFieldApi }) {
return (
<>
{field.state.meta.isTouched && !field.state.meta.isValid ? (
<em>{field.state.meta.errors.join(',')}</em>
) : null}
{field.state.meta.isValidating ? 'Validating...' : null}
</>
)
}
export default function App() {
const form = useForm({
defaultValues: {
firstName: '',
lastName: '',
},
onSubmit: async ({ value }) => {
// Do something with form data
console.log(value)
},
})
return (
<div>
<h1>Simple Form Example</h1>
<form
onSubmit={(e) => {
e.preventDefault()
e.stopPropagation()
form.handleSubmit()
}}
>
<div>
{/* A type-safe field component*/}
<form.Field
name="firstName"
validators={{
onChange: ({ value }) =>
!value
? 'A first name is required'
: value.length < 3
? 'First name must be at least 3 characters'
: undefined,
onChangeAsyncDebounceMs: 500,
onChangeAsync: async ({ value }) => {
await new Promise((resolve) => setTimeout(resolve, 1000))
return (
value.includes('error') && 'No "error" allowed in first name'
)
},
}}
children={(field) => {
// Avoid hasty abstractions. Render props are great!
return (
<>
<label htmlFor={field.name}>First Name:</label>
<input
id={field.name}
name={field.name}
value={field.state.value}
onBlur={field.handleBlur}
onChange={(e) => field.handleChange(e.target.value)}
/>
<FieldInfo field={field} />
</>
)
}}
/>
</div>
<div>
<form.Field
name="lastName"
children={(field) => (
<>
<label htmlFor={field.name}>Last Name:</label>
<input
id={field.name}
name={field.name}
value={field.state.value}
onBlur={field.handleBlur}
onChange={(e) => field.handleChange(e.target.value)}
/>
<FieldInfo field={field} />
</>
)}
/>
</div>
<form.Subscribe
selector={(state) => [state.canSubmit, state.isSubmitting]}
children={([canSubmit, isSubmitting]) => (
<>
<button type="submit" disabled={!canSubmit}>
{isSubmitting ? '...' : 'Submit'}
</button>
<button
type="reset"
onClick={(e) => {
// Avoid unexpected resets of form elements (especially <select> elements)
e.preventDefault()
form.reset()
}}
>
Reset
</button>
</>
)}
/>
</form>
</div>
)
}
const rootElement = document.getElementById('root')!
createRoot(rootElement).render(
<React.StrictMode>
<App />
<TanStackDevtools
config={{ hideUntilHover: true }}
plugins={[formDevtoolsPlugin()]}
/>
</React.StrictMode>,
)
