CODEWITHSUNDEEP
javascriptjoi
tazmin32w
tazmin32w

Reputation: 157

Joi async custom validation

I need to validate this object:

{a: 'valueA', b: 'valueB'}

To validate 'a' i need to check if his value (valueA) is present in my db. If the value is not present then the object is not valid, otherwhise is valid. How can I create a custom async/await with Joi validator to achieve this?

Upvotes: 5

Views: 4137

Answers (1)

Tamas Szoke
Tamas Szoke

Reputation: 5552

You can add external validation using the any.external() method, it receives a function as a parameter, so can be used to check the database for values.

The received functions' first parameter is the clone of the object you set to be validated. It runs after all other validations. If schema validation failed, no external validation rules are called.

const checkData = async (data) => {
  const res = await db.find({ name: data.a }) // or any method you use
  if (!res) {
    throw new Error('Data not found in db!')
  }
}

const schema = Joi.string().external(checkData)
await schema.validateAsync({ a: 'valueA', b: 'valueB' })

More information

Upvotes: 2

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