Firestore Query

firestore.js

//**********************************************
// Get all documents
//**********************************************
router.get('/', async function(req, res, next) {
  const title = 'Boozeyum';
  let cityRef = await db.collection('cities');
  const data = [];
  let getDoc = await cityRef.get()
    .then(snapshot => {
      snapshot.docs.forEach(doc => {
        data.push(doc.data());
      });
      return snapshot.docs.map(doc => doc.data());
    })
    .catch(err => {
      console.log('Error getting document', err);
      return null;
    });

  return res.render('index', { title: title, data: data });
});

//**********************************************
// Get document item
//**********************************************
router.get('/', async function(req, res, next) {
  const title = 'Boozeyum';
    let cityRef = await db.collection('cities').doc('SF');
    let getDoc = await cityRef.get().then(doc => {
      if (!doc.exists) return null;
      console.log('Document data:', doc.data());
      return doc.data();
    })
    .catch(err => {
      console.log('Error getting document', err);
      return null;
    });

    console.log(getDoc);
    return res.render('index', { title: title, data: getDoc });
  });
});