Transform Empty String To Null

I’ve been struggling getting this implementation to work as I expect. accountingId: Yup.string().nullable(true).default(null).transform(( function(value, originalValue) { if (!value) { return null; } return originalValue; })),

I am using this with Formik’s Validation Schema with the expectation that it will transform on submit – despite the validation running, it does not transform the empty string to null.

[jquense]

Formik, does run the transforms but it doesn’t pass back the transformed value to the onSubmit handler. You’d need to manually schema.cast(submittedValue) to get it

[osvaldokalvaitir]

@titasPartikas Thanks for the answer. I preferred to make a function on the backend that transforms empty into null.