react-hook-form

What is react-hook-form?

The react-hook-form npm package is a flexible and performant library that simplifies the process of working with forms in React applications. It provides hooks and components to manage form state and validation with minimal re-renders.

What are react-hook-form's main functionalities?

Easy Form State Management

This feature allows you to easily manage form state, handle form submissions, and integrate form validation.

import React from 'react';
import { useForm } from 'react-hook-form';

function MyForm() {
  const { register, handleSubmit, watch, errors } = useForm();
  const onSubmit = data => console.log(data);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input name='example' defaultValue='test' ref={register} />
      <input name='exampleRequired' ref={register({ required: true })} />
      {errors.exampleRequired && <span>This field is required</span>}
      <input type='submit' />
    </form>
  );
}

Form Validation

This feature provides built-in validation methods and allows you to create custom validation rules for your form inputs.

import React from 'react';
import { useForm } from 'react-hook-form';

function MyForm() {
  const { register, handleSubmit, errors } = useForm();
  const onSubmit = data => console.log(data);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input name='example' ref={register({ required: 'This is required' })} />
      {errors.example && <p>{errors.example.message}</p>}
      <input type='submit' />
    </form>
  );
}

Integrating with UI Libraries

This feature allows you to easily integrate react-hook-form with other UI libraries like react-select, material-ui, and antd.

import React from 'react';
import { useForm, Controller } from 'react-hook-form';
import Select from 'react-select';

function MyForm() {
  const { control, handleSubmit } = useForm();
  const onSubmit = data => console.log(data);

  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <Controller
        as={Select}
        options={[{ value: 'chocolate', label: 'Chocolate' }]}
        name='ReactSelect'
        isClearable
        control={control}
        rules={{ required: true }}
      />
      <input type='submit' />
    </form>
  );
}

Other packages similar to react-hook-form

formik

Formik is another popular form library for React. It is known for its simplicity and support for complex form logic. Compared to react-hook-form, Formik may have a slightly larger bundle size and potentially more re-renders, but it offers a more declarative API and built-in helpers for managing form state.

redux-form

Redux-form integrates form state into the Redux store, providing deep integration with Redux. It is suitable for complex form handling in large-scale applications. However, it can be overkill for simple forms and may lead to more boilerplate compared to react-hook-form, which is more lightweight and requires less setup.

final-form

Final Form is a subscription-based form state management library that separates form state from the UI layer. It is framework-agnostic and can be used with React via react-final-form. It offers fine-grained control over form rendering, but react-hook-form tends to have better performance due to its use of uncontrolled components.

README

React hook form validation without the hassle

 

• Super easy to create forms and integrate
• Build with React hook, performance and developer experience in mind
• Follow html standard for validation
• Tiny size without other dependency 2 kB (minified + gzipped)
• Build a quick form with form builder

Install

$ npm install react-hook-form

Docs

• Get started
• API
• Examples
• Demo
• Form Builder

Quickstart

import React from 'react'
import useForm from 'react-hook-form'

function App() {
  const { register, handleSubmit, errors } = useForm()
  const onSubmit = (data) => { console.log(data) }
  console.log(errors)
    
  return (
    <form onSubmit={handleSubmit(onSubmit)}>
      <input name="firstname" ref={register} />
      <input name="lastname" ref={register({ required: true })} />
      <input name="lastname" ref={register({ pattern: "[a-z]{1,15}" })} />
      <input type="submit" />
    </form>
  )
}