How to use enum values with Joi String validation

You can use valid.

const schema = Joi.object().keys({
  type: Joi.string().valid('ios', 'android'),
});

const myObj = { type: 'none' };
const result = Joi.validate(myObj, schema);
console.log(result);

This gives an error ValidationError: child "type" fails because ["type" must be one of [ios, android]]

Maybe it will be useful for anyone who wants to check values based on existing enum/array of values.

const SomeEnumType = { TypeA: 'A', TypeB: 'B' };

Then just use this:

const schema = Joi.object().keys({
  type: Joi.string().valid(...Object.values(SomeEnumType)),
});

const myObj = { type: 'none' };
const result = Joi.validate(myObj, schema);

I am late for this answer. But following will helpful for others, who wants to use enum values with Joi String validation :

function validateBody(bodyPayload) {
    const schema = Joi.object({
        device_key : Joi.string().required(),
        type : Joi.string().valid('ios','android'),

    });
    return schema.validate(admin);
}

const bodyPayload = {device_key:"abc", type: "web"};
const result = validateBody(bodyPayload);

reference : https://hapi.dev/module/joi/api/#anyallowvalues