Joi validation multiple conditions

Question

I have the following schema:

var testSchema = Joi.object().keys({
    a: Joi.string(), 
    b: Joi.string(), 
    c: Joi.string().when('a', {'is': 'avalue', then: Joi.string().required()})
});

but I would like to add a condition on c field definition so that it is required when:

a == 'avalue' AND b=='bvalue'

How can I do that?

score 45 · Accepted Answer · answered Oct 22 '14 at 15:52

45

You can concatenate two when rules:

var schema = {
    a: Joi.string(),
    b: Joi.string(),
    c: Joi.string().when('a', { is: 'avalue', then: Joi.string().required() }).concat(Joi.string().when('b', { is: 'bvalue', then: Joi.string().required() }))
};

answered Oct 22 '14 at 15:52

Gergo Erdosi

40,904
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1

Please what if I want to group values. like say when takes one of a collection of values and set the validation rule? – cdaiga May 20 '20 at 07:46
I want the same. Need to check if the key has a value in an array. – cegprakash Jul 14 '20 at 13:52

Simian · Answer 2 · 2020-05-16T08:07:00.570

28

The answer by Gergo Erdosi didn't work with Joi 14.3.0, this resulted in an OR condition:

a === 'avalue' || b === 'bvalue'

The following worked for me:

var schema = {
  a: Joi.string(),
  b: Joi.string(),
  c: Joi.string().when(
    'a', {
      is: 'avalue',
      then: Joi.when(
        'b', {
          is: 'bvalue',
          then: Joi.string().required()
        }
      )
    }
  )
};

This results in a === 'avalue' && b === 'bvalue'

edited May 16 '20 at 08:07

answered Dec 06 '18 at 08:36

Simian

814
11
21

yes, I think this is also a better syntax – Kat Lim Ruiz Feb 19 '21 at 21:24

Joi validation multiple conditions

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