Allow optional parameters in Joi without specifying them

You can set allowUnknown to true in options:

validate: {
  payload: {
    email : Joi.string().required(),
    password : Joi.string().required(),
  },
  options: {
    allowUnknown: true
  }
}

The options parameter is passed to Joi on validation.

For current version of Joi (v15.1.0), while doing

Joi.validate(value, schema, options)

set allowUnknown: true

into the options object.

Reference:

https://github.com/hapijs/joi/blob/v15.1.0/API.md#validatevalue-schema-options-callback

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