CODEWITHSUNDEEP
node.jsgoogle-cloud-firestorefirebase-admin
Menas
Menas

Reputation: 1259

How do you count documents in a firestore collection using the admin SDK?

I tried CollectionReference.count as in the documentation here (admin.firestore().collection("users").count()) but it says

TypeError: collectionReference.count is not a function

I also tried: (admin.firestore().collection("users").countDocuments())

And still:

TypeError: collectionReference.countDocuments is not a function

Upvotes: 1

Views: 853

Answers (1)

Peter Obiechina
Peter Obiechina

Reputation: 2835

To get the size of a collection, do this:

According to the Count docs: The server calculates the count, and transmits only the result, a single integer, back to your app, saving on both billed document reads and bytes transferred, compared to executing the full query.

// Below is in preview 
const collectionRef = admin.firestore().collection('users');
const snapshot = await collectionRef.count().get();
console.log(snapshot.data().count);

// below will fetch all the data and count it. It is more expensive.
const snapshot = await admin.firestore().collection("users").get();
// your function should be async
console.log('collection size is: ', snapshot.size);

// or
console.log('collection size is: ', snapshot.docs.length);

You must fetch the collection before getting the length.

Upvotes: 2

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