Allow only specific values for key in Joi schema

Question

Is there any other way to set specific values in Joi validation schema for key except regex pattern?

My example schema:

const schema = joi.object().keys({
    query: joi.object().keys({
        // allow only apple and banana
        id: joi.string().regex(/^(apple|banana)$/).required(),
    }).required(),
})

Answer 1

You can also use valid like

const schema = joi.object().keys({
  query: joi.object().keys({
    // allow only apple and banana
    id: joi.string().valid('apple','banana').required(),
  }).required(),
})

Reference: https://github.com/hapijs/joi/blob/v13.1.2/API.md#anyvalidvalue---aliases-only-equal

Answer 2

If you want to accept one or more values (apple, banana or both) you can use allow: https://joi.dev/api/?v=17.3.0#anyallowvalues

Answer 3

You can try with .valid() to allow joi only with that specific string .

const schema = joi.object().keys({
  query: joi.object().keys({
    role: joi.string().valid('admin','student').required(), // joi would allow only if role is admin or student.
  }).required(),
})

This is absolutely equal to giving "enam" field in mongoose ODM for representing objects in mongodb.