console.log("Starting")
var firebase = require("firebase/app");

// Add the Firebase products that you want to use
require("firebase/auth");
require("firebase/firestore");
require('firebase/database');


console.log("Firebase was imported")

var firebaseConfig = {
    apiKey: ...,
    authDomain: ...,
    databaseURL: ...,
    projectId: ...,
    storageBucket: ...,
    messagingSenderId: ...,
    appId: ...
  };
  // Initialize Firebase

console.log("Firebase  initializition")
firebase.initializeApp(firebaseConfig);

console.log("connect to db")
var database = firebase.database();


function writeApartmentData(apartmentId, street_, number_, floor_, door_) {
    firebase.database().ref('apartments/' + apartmentId).set({
      street: street_,
      number: number_,
      floor: floor_,
      door: door_

    });
  }

console.log("write apartment data")
writeApartmentData(1, "calle amalia", 18, 3, "B")



console.log("End");

luca@luca-VirtualBox:~/PisoReview$ node index.js
Starting
Firebase was imported
Firebase  initializition
connect to db
write apartment data
End
[2019-06-16T17:52:19.193Z]  @firebase/database: FIREBASE WARNING: set at /apartments/1 failed: permission_denied
(node:10870) UnhandledPromiseRejectionWarning: Error: PERMISSION_DENIED: Permission denied
    at /home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:13139:33
    at exceptionGuard (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:695:9)
    at Repo.callOnCompleteCallback (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:13130:13)
    at /home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:12907:19
    at /home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:12078:17
    at PersistentConnection.onDataMessage_ (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:12111:17)
    at Connection.onDataMessage_ (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:11394:14)
    at Connection.onPrimaryMessageReceived_ (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:11388:18)
    at WebSocketConnection.onMessage (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:11289:27)
    at WebSocketConnection.appendFrame_ (/home/luca/PisoReview/node_modules/@firebase/database/dist/index.node.cjs.js:10892:18)
(node:10870) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:10870) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
^C
luca@luca-VirtualBox:~/PisoReview$ ^C