voluptasmollitia/docs-exp/firestore_lite.collectiongroup.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/firestore](./firestore.md) &gt; [lite](./firestore_lite.md) &gt; [collectionGroup](./firestore_lite.collectiongroup.md)

## collectionGroup() function

Creates and returns a new `Query` instance that includes all documents in the database that are contained in a collection or subcollection with the given `collectionId`<!-- -->.

<b>Signature:</b>

```typescript
export declare function collectionGroup(firestore: FirebaseFirestore, collectionId: string): Query<DocumentData>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  firestore | [FirebaseFirestore](./firestore_lite.firebasefirestore.md) | A reference to the root Firestore instance. |
|  collectionId | string | Identifies the collections to query over. Every collection or subcollection with this ID as the last segment of its path will be included. Cannot contain a slash. |

<b>Returns:</b>

[Query](./firestore_lite.query.md)<!-- -->&lt;[DocumentData](./firestore_lite.documentdata.md)<!-- -->&gt;

The created `Query`<!-- -->.