How can I implement async validation in my form?

How can I implement async validation in my form?

You can implement async validation by using promises in your validation function. What framework are you using?

I'm using React with Formik.

Great! You can use Formik's validate function to return a promise. This allows you to perform async checks.

Can you give me a code example?

Sure! Here's a simple example:

const validate = async (values) => {
  const errors = {};
  if (!values.email) {
    errors.email = 'Required';
  } else if (!isValidEmail(values.email)) {
    errors.email = 'Invalid email';
  } else {
    const isTaken = await checkEmailExists(values.email);
    if (isTaken) {
      errors.email = 'Email already taken';
    }
  }
  return errors;
};

This function checks if the email is valid and if it already exists.