Automatically trim white spaces with Yup and Formik

Question

I am using a Formik React Form and Yup validation defined on a schema:

export const Contact = yup.object<IContact>().shape({
  contactName: yup
    .string()
    .trim('The contact name cannot include leading and trailing spaces')
    .strict(true)
    .min(1, 'The contact name needs to be at least 1 char')
    .max(512, 'The contact name cannot exceed 512 char')
    .required('The contact Name is required'),
});

Is there a way to have Yup trim white spaces without showing a message? So automatically trimming the spaces when a form is submitted?

Answer 1

Is there a way to have Yup trim white spaces without showing a message

Not in a single transform. The yup transform used by formik is only for validation. You can create a seperate transform to use before passing the data, but its simpler to just valueToUse = userValue.trim() yourself.