如何用Joi验证一个字符串不等于另一个（黑名单）？

Question

A classical example is:

schema = Joi.object().keys({
    my_string: Joi.string().valid("myString").required()
});

This validate that object have field my_string which must have a myString as value.

How check that key my_string is not equal to notAllowedString ?

Answer 1

you can use invalid to blacklist a value ( link for ref )

schema = Joi.object().keys({
    my_string: Joi.string().invalid("notAllowedString").required()
});