joi.string() fails on empty string

[jonaswindey]

I have a property "email" that is defined like this:
email: joi.string().description('E-mail')

(so not required())

However, this object doesn't validate:

{
"email": ""
}

Is this gives the message "email is not allowed to be empty"

What can I do to have a property that's a string but that can also be an empty string? If I use joi.any() it passes, but of course I only want strings or empty strings. I also don't want to remove the empty properties before validating, because I effectively want to store an empty value in the database.

[arb]

Did you try joi.string().allow('')?

[jonaswindey]

My bad, I didn't see it under string but indeed it works! Thanks