Firestore - Creating an entry (Document) with an auto-generated ID

creating_auto_entry.js

db.collection("[YOUR_COLLECTION]").add({
    [YOUR_PROPERTY]: "[YOUR_UPDATED_VALUE]"
})
.then(function(docRef) {
    console.log("Document written with ID: ", docRef.id);
})
.catch(function(error) {
    console.error("Error adding document: ", error);
});