How can I implement async validations using Yup?

How can I implement async validations using Yup?

You can use the test method in Yup to create async validations. Would you like a code example?

Yes, please provide a code example.

Sure! Here's a simple example:

import * as Yup from 'yup';

const schema = Yup.object().shape({
  email: Yup.string()
    .email('Invalid email')
    .test('checkEmail', 'Email already exists', async value => {
      const response = await fetch(`/api/check-email?email=${value}`);
      const data = await response.json();
      return data.exists === false;
    }),
});

This checks if the email already exists asynchronously.

What if I want to validate multiple fields asynchronously?

You can chain multiple test methods or use when to conditionally validate fields based on others. Would you like to see an example?