const { MTProto } = require('@mtproto/core');

const api_id = 'YOU_API_ID';
const api_hash = 'YOU_API_HASH';

// 1. Create an instance
const mtproto = new MTProto({
  api_id,
  api_hash,

  // Use test servers
  test: true,
});

// 2. Get the user country code
mtproto.call('help.getNearestDc').then(result => {
  console.log(`country:`, result.country);
});