Conditional Validation in Yup

Question

I have an email field that only gets shown if a checkbox is selected (boolean value is true). When the form get submitted, I only what this field to be required

Answer 1

Formik author here...

To make Yup.when work properly, you would have to add showEmail to initialValues and to your Yup schema shape.

In general, when using validationSchema, it is best practices to ensure that all of you form's fields have initial values so that Yup can see them immediately.

The result would look like: