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React Hook Form

React Hook Form

Building forms with React Hook Form and Zod.

Docs

Forms are tricky. They are one of the most common things you'll build in a web application, but also one of the most complex.

Well-designed HTML forms are:

  • Well-structured and semantically correct.
  • Easy to use and navigate (keyboard).
  • Accessible with ARIA attributes and proper labels.
  • Has support for client and server side validation.
  • Well-styled and consistent with the rest of the application.

In this guide, we will take a look at building forms with react-hook-form and zod. We're going to use a <FormField> component to compose accessible forms using Radix UI components.

Features

The <Form /> component is a wrapper around the react-hook-form library. It provides a few things:

  • Composable components for building forms.
  • A <FormField /> component for building controlled form fields.
  • Form validation using zod.
  • Handles accessibility and error messages.
  • Uses React.useId() for generating unique IDs.
  • Applies the correct aria attributes to form fields based on states.
  • Built to work with all Radix UI components.
  • Bring your own schema library. We use zod but you can use anything you want.
  • You have full control over the markup and styling.

Anatomy

<Form>
  <FormField
    control={...}
    name="..."
    render={() => (
      <FormItem>
        <FormLabel />
        <FormControl>
          { /* Your form field */}
        </FormControl>
        <FormDescription />
        <FormMessage />
      </FormItem>
    )}
  />
</Form>

Example

const form = useForm()
 
<FormField
  control={form.control}
  name="username"
  render={({ field }) => (
    <FormItem>
      <FormLabel>Username</FormLabel>
      <FormControl>
        <Input placeholder="shadcn" {...field} />
      </FormControl>
      <FormDescription>This is your public display name.</FormDescription>
      <FormMessage />
    </FormItem>
  )}
/>

Installation

Install the following dependencies:

npm install @radix-ui/react-label @radix-ui/react-slot react-hook-form @hookform/resolvers zod

Copy and paste the following code into your project.

import * as React from "react"
import * as LabelPrimitive from "@radix-ui/react-label"
import { Slot } from "@radix-ui/react-slot"
import {
  Controller,
  ControllerProps,
  FieldPath,
  FieldValues,
  FormProvider,
  useFormContext,
} from "react-hook-form"
 
import { cn } from "@/lib/utils"
import { Label } from "@/components/ui/label"
 
const Form = FormProvider
 
type FormFieldContextValue<
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
> = {
  name: TName
}
 
const FormFieldContext = React.createContext<FormFieldContextValue>(
  {} as FormFieldContextValue
)
 
const FormField = <
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
>({
  ...props
}: ControllerProps<TFieldValues, TName>) => {
  return (
    <FormFieldContext.Provider value={{ name: props.name }}>
      <Controller {...props} />
    </FormFieldContext.Provider>
  )
}
 
const useFormField = () => {
  const fieldContext = React.useContext(FormFieldContext)
  const itemContext = React.useContext(FormItemContext)
  const { getFieldState, formState } = useFormContext()
 
  const fieldState = getFieldState(fieldContext.name, formState)
 
  if (!fieldContext) {
    throw new Error("useFormField should be used within <FormField>")
  }
 
  const { id } = itemContext
 
  return {
    id,
    name: fieldContext.name,
    formItemId: `${id}-form-item`,
    formDescriptionId: `${id}-form-item-description`,
    formMessageId: `${id}-form-item-message`,
    ...fieldState,
  }
}
 
type FormItemContextValue = {
  id: string
}
 
const FormItemContext = React.createContext<FormItemContextValue>(
  {} as FormItemContextValue
)
 
const FormItem = React.forwardRef<
  HTMLDivElement,
  React.HTMLAttributes<HTMLDivElement>
>(({ className, ...props }, ref) => {
  const id = React.useId()
 
  return (
    <FormItemContext.Provider value={{ id }}>
      <div ref={ref} className={cn("space-y-2", className)} {...props} />
    </FormItemContext.Provider>
  )
})
FormItem.displayName = "FormItem"
 
const FormLabel = React.forwardRef<
  React.ElementRef<typeof LabelPrimitive.Root>,
  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
>(({ className, ...props }, ref) => {
  const { error, formItemId } = useFormField()
 
  return (
    <Label
      ref={ref}
      className={cn(error && "text-destructive", className)}
      htmlFor={formItemId}
      {...props}
    />
  )
})
FormLabel.displayName = "FormLabel"
 
const FormControl = React.forwardRef<
  React.ElementRef<typeof Slot>,
  React.ComponentPropsWithoutRef<typeof Slot>
>(({ ...props }, ref) => {
  const { error, formItemId, formDescriptionId, formMessageId } = useFormField()
 
  return (
    <Slot
      ref={ref}
      id={formItemId}
      aria-describedby={
        !error
          ? `${formDescriptionId}`
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!error}
      {...props}
    />
  )
})
FormControl.displayName = "FormControl"
 
const FormDescription = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, ...props }, ref) => {
  const { formDescriptionId } = useFormField()
 
  return (
    <p
      ref={ref}
      id={formDescriptionId}
      className={cn("text-sm text-muted-foreground", className)}
      {...props}
    />
  )
})
FormDescription.displayName = "FormDescription"
 
const FormMessage = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, children, ...props }, ref) => {
  const { error, formMessageId } = useFormField()
  const body = error ? String(error?.message) : children
 
  if (!body) {
    return null
  }
 
  return (
    <p
      ref={ref}
      id={formMessageId}
      className={cn("text-sm font-medium text-destructive", className)}
      {...props}
    >
      {body}
    </p>
  )
})
FormMessage.displayName = "FormMessage"
 
export {
  useFormField,
  Form,
  FormItem,
  FormLabel,
  FormControl,
  FormDescription,
  FormMessage,
  FormField,
}

Update the import paths to match your project setup.

Usage

Create a form schema

Define the shape of your form using a Zod schema. You can read more about using Zod in the Zod documentation.

"use client"
 
import { z } from "zod"
 
const formSchema = z.object({
  username: z.string().min(2).max(50),
})

Define a form

Use the useForm hook from react-hook-form to create a form.

"use client"
 
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { z } from "zod"
 
const formSchema = z.object({
  username: z.string().min(2, {
    message: "Username must be at least 2 characters.",
  }),
})
 
export function ProfileForm() {
  // 1. Define your form.
  const form = useForm<z.infer<typeof formSchema>>({
    resolver: zodResolver(formSchema),
    defaultValues: {
      username: "",
    },
  })
 
  // 2. Define a submit handler.
  function onSubmit(values: z.infer<typeof formSchema>) {
    // Do something with the form values.
    // ✅ This will be type-safe and validated.
    console.log(values)
  }
}

Since FormField is using a controlled component, you need to provide a default value for the field. See the React Hook Form docs to learn more about controlled components.

Build your form

We can now use the <Form /> components to build our form.

"use client"
 
import { zodResolver } from "@hookform/resolvers/zod"
import { useForm } from "react-hook-form"
import { z } from "zod"
 
import { Button } from "@/components/ui/button"
import {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
} from "@/components/ui/form"
import { Input } from "@/components/ui/input"
 
const formSchema = z.object({
  username: z.string().min(2, {
    message: "Username must be at least 2 characters.",
  }),
})
 
export function ProfileForm() {
  // ...
 
  return (
    <Form {...form}>
      <form onSubmit={form.handleSubmit(onSubmit)} className="space-y-8">
        <FormField
          control={form.control}
          name="username"
          render={({ field }) => (
            <FormItem>
              <FormLabel>Username</FormLabel>
              <FormControl>
                <Input placeholder="shadcn" {...field} />
              </FormControl>
              <FormDescription>
                This is your public display name.
              </FormDescription>
              <FormMessage />
            </FormItem>
          )}
        />
        <Button type="submit">Submit</Button>
      </form>
    </Form>
  )
}

Done

That's it. You now have a fully accessible form that is type-safe with client-side validation.

TODO fix this form input component

Examples

See the following links for more examples on how to use the <Form /> component with other components: