You are looking for the valid
and invalid
functions.
v16: https://hapi.dev/module/joi/api/?v=16.1.8#anyvalidvalues—aliases-equal
v17: https://hapi.dev/module/joi/api/?v=17.1.1#anyvalidvalues—aliases-equal
As of Joi v16 valid
and invalid
no longer accepts arrays, they take a variable number of arguments.
Your code becomes
var schema = Joi.object().keys({
firstname: Joi.string().valid(...['a','b']),
lastname: Joi.string().invalid(...['c','d']),
});
Can also just pass in as .valid('a', 'b')
if not getting the values from an array (-: