Firestore - Get document collections

Question

I would automate the backup process of a firestore database.

The idea is to loop over the root document to build a JSON tree, but I didn't find a way to get all collections available for a document. I guess it's possible as in firestore console we can see the tree.

Any ideas?

• ref doc: https://firebase.google.com/docs/reference/js/firebase.firestore

Answer 1

Its possible on web (client side js)

db.collection('FirstCollection/' + id + '/DocSubCollectionName').get().then((subCollectionSnapshot) => {
    subCollectionSnapshot.forEach((subDoc) => {
        console.log(subDoc.data());
    });
});

Thanks to @marcogramy comment

Answer 2

Update
API has been updated, now function is .listCollections() https://googleapis.dev/nodejs/firestore/latest/DocumentReference.html#listCollections

---

getCollections() method is available for NodeJS.

Sample code:

    db.collection("Collection").doc("Document").getCollections().then((querySnapshot) => {
    querySnapshot.forEach((collection) => {
        console.log("collection: " + collection.id);
        });
    });