How can I add validation in Joi that old and new passwords should not be same?

Question

I am building Apis using NodeJS & ExpressJS and Joi for schema validation.

Here is my Joi validation for my resetUserPinCode controller where I want to check that oldPinCode and newPinCode should not be the same:

const resetUserPinCode = {
  body: Joi.object().keys({
    phoneNumber: Joi.string().required(),
    oldPinCode: Joi.alternatives().try(Joi.string(), Joi.number()).required(),
    newPinCode: Joi.alternatives().try(Joi.string(), Joi.number()).required(),
  }),
};

I can add check in resetUserPinCode function that oldPinCode and newPinCode are not same but I want to add that in my Joi validation schema. Is there any way I can add that validation in my Joi schema?

Answer 1

This functionality can be achieved by using Joi.disallow() as shown below.

const resetUserPinCode = {
  body: Joi.object().keys({
    phoneNumber: Joi.string().required(),
    oldPinCode: Joi.alternatives().try(Joi.string(), Joi.number()).required(),
    newPinCode: Joi.alternatives().try(Joi.string(), Joi.number()).disallow(Joi.ref('oldPinCode')).required(),
  }),
};