Mock data schema for randomized user data

mockDataSchema.js

var schema = {
  "type": "object",
  "properties": {
    "users": {
      "type": "array",
      "minItems": 3,
      "maxItems": 5,
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "number",
            "unique": true,
            "minimum": 1
          },
          "firstName": {
            "type": "string",
            "faker": "name.firstName"
          },
          "lastName": {
            "type": "string",
            "faker": "name.lastName"
          },
          "email": {
            "type": "string",
            "faker": "internet.email"
          }
        },
        "required": ["id", "type", "lastname", "email"]
      }
    }
  },
  "required": ["users"]
};

module.exports = schema;

This is what I am getting on my db.json using this schema:
{"users":[{"id":83599623.3686758,"firstName":"et dolor quis elit","lastName":"est Lorem cillum eiusmod","email":"esse aliqua"},{"id":95176111.18533652,"firstName":"voluptate fugiat","lastName":"sunt","email":"in est nisi"},{"id":26503812.812322445,"firstName":"dolore officia nisi do","lastName":"esse nul","email":"quis reprehenderit nisi minim"},{"id":9828782.78382918,"firstName":"dolore eiusmod non id cupidatat","lastName":"veniam consequat proident Excepteur sed","email":"laborum incididunt ullam"}]}