JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = {
  "livingroom": [
    {
      "app": "",
      "name": "s1",
      "thumbnail": "https://storage.googleapis.com/peterbucket/istagingViewer/sigstaging.com.tw/Cuiti/study/web/thumb_floorplan1.jpg"
    }
  ],
  "bedroom": [],
  "study": [
    {
      "app": "",
      "name": "s0",
      "thumbnail": "https://storage.googleapis.com/peterbucket/istagingViewer/sigstaging.com.tw/Cuiti/study/web/thumb_floorplan3.jpg"
    }
  ],
  "outdoor": [],
  "other": [],
  "id": "-KF28-_Vdve-u3498eQ1",
  "name": "Cuiti"
}
var _localArray = []
for(var keys in a){
if(Object.prototype.toString.call(a[keys] ) === '[object Array]' && a[keys].length>=1) {
  _localArray.push(a[keys]);
}
}
console.log(_localArray[0]);