[Home](./index.md) > [@firebase/firestore](./firestore.md) > [lite](./firestore_lite.md) > [DocumentSnapshot](./firestore_lite.documentsnapshot.md) > [data](./firestore_lite.documentsnapshot.data.md) ## DocumentSnapshot.data() method Retrieves all fields in the document as an `Object`. Returns `undefined` if the document doesn't exist. Signature: ```typescript data(): T | undefined; ``` Returns: T \| undefined An `Object` containing all fields in the document or `undefined` if the document doesn't exist.