function recover(num) {
  docId = app[num]
  console.log(`${dbendpoint}/${dbName}/${docId}/?revs=true&open_revs=all`)
  axios
    .get(`${dbendpoint}/${dbName}/${docId}/?revs=true&open_revs=all`)
    .then((result) => {
      data = JSON.parse(
        result.data.substring(
          result.data.indexOf("{"),
          result.data.lastIndexOf("}") + 1
        )
      );
      let prerev = data._revisions["start"] - 1;
      let postrev = data._revisions.ids[1];
      return (revNum = prerev + "-" + postrev);
    })
    .then((revNum) => {
      return axios.get(`${dbendpoint}/${dbName}/${docId}/?rev=${revNum}`);
    })
    .then((deletedDoc) => {
      delete deletedDoc.data._rev;
      return deletedDoc.data;
    })
    .then((deletedDoc) => {
      return axios.put(`${dbendpoint}/${dbName}/${docId}`, deletedDoc);
    })
    .then((data) => {
      let message = `${docId} restored sucessfully`;
      success.push(message);
    })
    .catch((err) => {
      let message = `${docId} restoring failed, ${err}`;
      failure.push(message);
    })
    .finally(()=>{
      nextNum = num+1
      if (nextNum < lastNum) {
        recover(nextNum)
      }
      else {
        return console.log({success, failure});
      }
    })
}

recover(0)