How can I integrate async validators in my React forms?

How can I integrate async validators in my React forms?

You can use libraries like Formik or React Hook Form along with async validation functions. Would you like a code example?

Yes, please provide a code example using Formik.

Sure! Here's a simple example:

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

const validateEmail = async (email) => {
  const response = await fetch(`/api/validate-email?email=${email}`);
  const data = await response.json();
  return data.isValid ? undefined : 'Email is already taken';
};

const MyForm = () => (
  <Formik
    initialValues={{ email: '' }}
    onSubmit={(values) => { console.log(values); }}
  >
    {({ setFieldError }) => (
      <Form>
        <Field name="email" type="email" />
        <ErrorMessage name="email" component="div" />
        <button type="submit">Submit</button>
      </Form>
    )}
  </Formik>
);

This example shows how to validate an email asynchronously.

What if I want to add multiple async validators?

You can chain multiple validation functions. Just ensure each function returns a promise. Would you like to see an example?