How can I implement conditional validations in Yup schema?

How can I implement conditional validations in Yup schema?

You can use the when method in Yup to create conditional validations based on other fields.

Can you give me an example of how to use the when method?

Sure! For instance, if you have a field 'age' and want to require 'parentalConsent' only if age is under 18, you can do this:

const schema = Yup.object().shape({
  age: Yup.number().required(),
  parentalConsent: Yup.string().when('age', {
    is: (age) => age < 18,
    then: Yup.string().required('Parental consent is required'),
    otherwise: Yup.string().notRequired(),
  }),
});

What if I have multiple conditions to check?

You can chain multiple when conditions or use an array of conditions to handle complex scenarios.