gunArraysToObject.js

const isArray = (a) => {
    return (!!a) && (a.constructor === Array);
};
const isObject = (a) => {
    return (!!a) && (a.constructor === Object);
};
const gunToObj = (obj,getKey,putKey) => {
  getKey = (typeof(getKey) === 'undefined') ? '_title' : getKey;
  putKey = (typeof(putKey) === 'undefined') ? 'title' : putKey;
 
  let new_obj = {};
  if(isObject(obj)){
    for (var key in obj) {
      if (obj.hasOwnProperty(key)) {
        new_obj[key] = gunToObj(obj[key],getKey,putKey);
      }
    }
    return new_obj;
  }else if(isArray(obj)){
    for(let i=0;i<obj.length;i++){
        if(isObject(obj[i]) && obj[i][getKey]){
          new_obj[obj[i][getKey]] = gunToObj(obj[i],getKey,putKey);
        }else{
          let tmp_obj = {};
          tmp_obj[putKey] = obj[i];
          new_obj[obj[i]] = tmp_obj; 
        }
    }
    return new_obj;
  }else{
    return obj;
  }
}