vee-validate

Pros of FormKit

• More comprehensive form-building solution with pre-built inputs and layouts
• Offers a plugin system for easy extensibility
• Provides a schema-based approach for defining forms, which can be useful for complex scenarios

Cons of FormKit

• Steeper learning curve due to its more opinionated structure
• Larger bundle size compared to Vee-Validate
• Less flexibility in terms of integration with existing form structures

Code Comparison

FormKit:

<FormKit
  type="form"
  :actions="false"
  @submit="submitHandler"
>
  <FormKit
    type="text"
    name="username"
    label="Username"
    validation="required|length:5"
  />
</FormKit>

Vee-Validate:

<Form @submit="submitHandler">
  <Field
    name="username"
    rules="required|min:5"
    v-slot="{ field, errors }"
  >
    <input v-bind="field" />
    <span>{{ errors[0] }}</span>
  </Field>
</Form>

Both libraries offer robust form validation capabilities, but FormKit provides a more all-in-one solution with pre-built components, while Vee-Validate focuses primarily on validation and offers more flexibility in terms of integration with existing form structures.

Pros of Formik

• More popular and widely adopted in the React ecosystem
• Extensive documentation and community support
• Seamless integration with React components and hooks

Cons of Formik

• Limited built-in validation rules, often requiring additional libraries
• Steeper learning curve for complex form scenarios
• React-specific, not suitable for other frameworks

Code Comparison

Formik:

import { Formik, Form, Field } from 'formik';

<Formik initialValues={{ email: '' }} onSubmit={handleSubmit}>
  <Form>
    <Field name="email" type="email" />
    <button type="submit">Submit</button>
  </Form>
</Formik>

Vee-Validate:

<template>
  <Form @submit="onSubmit">
    <Field name="email" type="email" :rules="emailRules" />
    <button>Submit</button>
  </Form>
</template>

<script>
import { Form, Field } from 'vee-validate';

export default {
  components: { Form, Field },
  setup() {
    const emailRules = 'required|email';
    const onSubmit = values => {
      // Handle form submission
    };
    return { emailRules, onSubmit };
  }
};
</script>

Both libraries offer similar functionality for form handling and validation, but Formik is more React-centric, while Vee-Validate is designed to work with Vue.js. Formik provides a more React-idiomatic approach, while Vee-Validate offers built-in validation rules and a slightly more concise syntax for Vue applications.

Pros of react-hook-form

• Lightweight and performant, with minimal re-renders
• Easy integration with React's hooks system
• Flexible validation options, including Yup and Joi

Cons of react-hook-form

• Limited built-in UI components
• Steeper learning curve for complex form scenarios
• Primarily focused on React, less versatile across frameworks

Code Comparison

react-hook-form:

import { useForm } from "react-hook-form";

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

<form onSubmit={handleSubmit(onSubmit)}>
  <input {...register("firstName")} />
  <input type="submit" />
</form>

vee-validate:

<template>
  <Form @submit="onSubmit">
    <Field name="firstName" />
    <button type="submit">Submit</button>
  </Form>
</template>

<script>
import { Form, Field } from 'vee-validate';

export default {
  components: { Form, Field },
  methods: {
    onSubmit(values) {
      console.log(values);
    }
  }
};
</script>

Summary

react-hook-form excels in performance and React integration, while vee-validate offers a more comprehensive solution with built-in UI components and cross-framework compatibility. react-hook-form may be preferred for React-specific projects prioritizing performance, whereas vee-validate might be chosen for its ease of use and versatility across different frameworks.

Pros of Unform

• Designed specifically for React, offering seamless integration with React components
• Supports complex form structures and nested fields out of the box
• Provides a more flexible and customizable API for form handling

Cons of Unform

• Less extensive documentation compared to Vee-Validate
• Smaller community and ecosystem, potentially leading to fewer third-party resources
• May have a steeper learning curve for developers new to React-specific form libraries

Code Comparison

Unform:

import { Form } from '@unform/web';
import Input from './components/Input';

function MyForm() {
  function handleSubmit(data) {
    console.log(data);
  }

  return (
    <Form onSubmit={handleSubmit}>
      <Input name="email" />
      <button type="submit">Submit</button>
    </Form>
  );
}

Vee-Validate:

<template>
  <Form @submit="onSubmit">
    <Field name="email" as="input" />
    <ErrorMessage name="email" />
    <button>Submit</button>
  </Form>
</template>

<script>
import { Form, Field, ErrorMessage } from 'vee-validate';

export default {
  components: { Form, Field, ErrorMessage },
  methods: {
    onSubmit(values) {
      console.log(values);
    }
  }
};
</script>

Pros of Final Form

• Framework-agnostic, can be used with any UI library or framework
• Smaller bundle size, lightweight core with optional add-ons
• Powerful subscription model for efficient re-renders

Cons of Final Form

• Steeper learning curve due to its flexible and low-level nature
• Requires more setup and configuration compared to Vee-Validate
• Less out-of-the-box features, may need additional plugins

Code Comparison

Vee-Validate:

import { defineRule, Form, Field } from 'vee-validate';

defineRule('required', value => {
  if (!value || !value.length) {
    return 'This field is required';
  }
  return true;
});

Final Form:

import { Form, Field } from 'react-final-form';

const validate = values => {
  const errors = {};
  if (!values.username) {
    errors.username = 'Required';
  }
  return errors;
};

Both libraries offer form validation, but Vee-Validate provides a more declarative approach with built-in rules, while Final Form offers a more programmatic and flexible validation system. Vee-Validate is Vue-specific, whereas Final Form can be used with any framework, including React as shown in the example.

Pros of Vuelidate

• Lightweight and minimalistic approach
• More flexible validation rules and custom validators
• Better integration with Vue's reactivity system

Cons of Vuelidate

• Steeper learning curve for complex validations
• Less out-of-the-box features compared to Vee-Validate
• Manual error handling and display

Code Comparison

Vuelidate:

import { required, minLength } from '@vuelidate/validators'

const rules = {
  name: { required, minLength: minLength(4) }
}

Vee-Validate:

import { extend, ValidationProvider } from 'vee-validate'
import { required, min } from 'vee-validate/dist/rules'

extend('required', required)
extend('min', min)

Vuelidate takes a more programmatic approach, allowing for easier customization of validation rules. Vee-Validate, on the other hand, provides a more declarative syntax with built-in components like ValidationProvider, which can simplify form handling in templates.

Both libraries offer robust validation solutions for Vue applications, but they differ in their implementation and philosophy. Vuelidate focuses on flexibility and integration with Vue's reactivity, while Vee-Validate provides a more opinionated structure with additional features out of the box.