Is there a way to validate dynamic key names in a Joi schema?

Question

Is there a way I can validate a value like this with Joi so that I can verify it is an object with zero or more keys (of any name) and that each have values of either a string, number or boolean?

{
  dynamicallyNamedKey1: 'some value',
  dynamicallyNamedKey2: 4
}

Answer 1

You're going to want to use Joi's object().pattern() method. It's specifically for validating objects with unknown keys.

To match against one or more datatypes on a single key you'll need alternatives().try() (or simply pass an array of Joi types).

So the rule to match your needs would be:

Joi.object().pattern(/^/, Joi.alternatives().try(Joi.string(), Joi.number(), Joi.boolean()))