CONFORM

A progressive enhancement first form validation library for Remix and React Router

Highlights

• Focused on progressive enhancement by default
• Simplifed integration through event delegation
• Server first validation with Zod / Yup schema support
• Field name inference with type checking
• Focus management
• Accessibility support
• About 5kb compressed

Quick Start

Here is an example built with Remix:

import { useForm } from '@conform-to/react';
import { parse } from '@conform-to/zod';
import { Form } from '@remix-run/react';
import { json } from '@remix-run/node';
import { z } from 'zod';
import { authenticate } from '~/auth';

const schema = z.object({
  email: z.string().min(1, 'Email is required').email('Email is invalid'),
  password: z.string().min(1, 'Password is required'),
});

export async function action({ request }: ActionArgs) {
  const formData = await request.formData();
  const submission = parse(formData, { schema });

  if (!submission.value || submission.intent !== 'submit') {
    return json(submission, { status: 400 });
  }

  return await authenticate(submission.value);
}

export default function LoginForm() {
  const lastSubmission = useActionData<typeof action>();
  const [form, { email, password }] = useForm({
    lastSubmission,
    onValidate({ formData }) {
      return parse(formData, { schema });
    },
  });

  return (
    <Form method="post" {...form.props}>
      <div>
        <label>Email</label>
        <input type="email" name={email.name} />
        <div>{email.error}</div>
      </div>
      <div>
        <label>Password</label>
        <input type="password" name={password.name} />
        <div>{password.error}</div>
      </div>
      <button>Login</button>
    </Form>
  );
}