sort descending in firebase Query code example

Example 1: firebase order by key descending

firebase.database().ref('books').orderByChild('ups').limitToLast(2)

Example 2: order documents in firestore

// Create Data
const timestamp = firebase.firestore.FieldValue.serverTimestamp;

db.collection('things').add({ ...myData, createdAt: timestamp() })


// Query
db.collection('things').orderBy('createdAt').startAfter(today)