How can I handle async validation errors in Formik?

How can I handle async validation errors in Formik?

You can handle async validation errors in Formik by using the validate function to return a promise that resolves to an object containing errors.

Can you show me an example of how to implement that?

Sure! You can define a validation function like this:

const validate = async (values) => {
  const errors = {};
  if (!values.email) {
    errors.email = 'Required';
  } else if (!isValidEmail(values.email)) {
    errors.email = 'Invalid email address';
  }
  return errors;
};

Then, pass this function to Formik's validate prop.

What if I want to show a loading state while validating?

You can manage a loading state using a local state variable. Set it to true before starting validation and false after it completes. You can then conditionally render a loading indicator in your form.