{
  "$schema" : "http://json-schema.org/draft-07/schema#",
  "required" : [
    "gstin"
  ],
  "type" : "object",
  "properties" : {
    "gstin" : {
      "maxLength" : 15,
      "minLength" : 15,
      "pattern" : "^([0-9]{2}[0-9A-Z]{13})$",
      "type" : "string"
    }
  }
}