{
  "Москва": [
    { "date": "2020-03-22", "confirmed": "191", "deaths": "0", "recovered": "8" },
    { "date": "2020-03-23", "confirmed": "262", "deaths": "0", "recovered": "9" },
    { "date": "2020-03-24", "confirmed": "290", "deaths": "0", "recovered": "9" },
    //...
  ],
  //...
}

fetch("https://jeetiss.github.io/covid19-russia/timeseries.json")
  .then(response => response.json())
  .then(data => {
    data["Ростовская область"].forEach(({ date, confirmed, recovered, deaths }) =>
      console.log(`${date} active cases: ${confirmed - recovered - deaths}`)
    );
  });