[Home](./index.md) > [@firebase/firestore](./firestore.md) > [lite](./firestore_lite.md) > [QueryDocumentSnapshot](./firestore_lite.querydocumentsnapshot.md) ## QueryDocumentSnapshot class A `QueryDocumentSnapshot` contains data read from a document in your Firestore database as part of a query. The document is guaranteed to exist and its data can be extracted with `.data()` or `.get()` to get a specific field. A `QueryDocumentSnapshot` offers the same API surface as a `DocumentSnapshot`. Since query results contain only existing documents, the `exists` property will always be true and `data()` will never return 'undefined'. Signature: ```typescript export declare class QueryDocumentSnapshot extends DocumentSnapshot ``` Extends: [DocumentSnapshot](./firestore_lite.documentsnapshot.md)<T> ## Methods | Method | Modifiers | Description | | --- | --- | --- | | [data()](./firestore_lite.querydocumentsnapshot.data.md) | | Retrieves all fields in the document as an Object. |