I have installed and imported validator module in the node js file.

I want to validate the User's phone number using npm module "Validator" I have written the code as below but it is Not Working. It is inside of the schema

phone: {
    type: Number,
    required: true,
    unique:true,
    validate(value) {
      if(!validator.isMobilePhone(value)){
        throw new error ("Please enter valid phone number")
    }
  }

It is saving all the invalid phone numbers as well like jist : 1234.

How to solve this?