Why does the sequelize database create fewer items than it should in a loop, but everything is fine without the loop?

Question

JavaScript

I need to get all the cities that are in the VK database. Without a cycle, a document is created for the entire thousand items, only 3-4 documents are created in the cycle. Why is this happening? what to do?

spoiler

const City = sequelize.define("city", 
  {
    id: {
      type: Sequelize.INTEGER,
      autoIncrement: true,
      primaryKey: true,
      allowNull: false
    },
    title: {
      type: Sequelize.STRING,
      allowNull: false
    },
    area: {
      type: Sequelize.STRING,
      allowNull: false
    },
    region: {
      type: Sequelize.STRING,
      allowNull: false
    },
  }
  );

  let offset = 0;
  let count  = 1;
  
  do {
    let response = await axios.get(`https://api.vk.com/method/\
database.getCities?\
&country_id=1&need_all=1&count=1000&offset=${offset}&\
access_token=${vk.vk.ACCESS_TOKEN}&v=5.110`);
    let items = response.data.response.items

    items.map(async function(item) {
      City.create({
        id: item.id,
        title: item.title,
        area: item.area ? item.area: '',
        region: item.region ? item.region: '',
      }).then(res => {console.log(res.title)})
        .catch(error => {console.log(error)})
    })

    offset += response.data.response.items.length;
    count = response.data.response.count;
    console.log(`offset: ${offset}\ncount: ${count}`);
  } while (offset != count);

Answer 1

I think you have a problem with the loop exit condition:

offset += response.data.response.items.length;
    count = response.data.response.count;
    console.log(`offset: ${offset}\ncount: ${count}`);
  } while (offset != count);

the loop is executed until the number of records received from the API is equal to the offset.
But, it will be equal to you already at the first iteration, it turns out that your loop will work once.
What do you output to the console?
console.log(`offset: ${offset}\ncount: ${count}`);