[Home](./index.md) > [@firebase/firestore](./firestore.md) > [lite](./firestore_lite.md) > [DocumentReference](./firestore_lite.documentreference.md) > [withConverter](./firestore_lite.documentreference.withconverter.md) ## DocumentReference.withConverter() method Applies a custom data converter to this `DocumentReference`, allowing you to use your own custom model objects with Firestore. When you call [setDoc()](./firestore_lite.setdoc.md), [getDoc()](./firestore_lite.getdoc.md), etc. with the returned `DocumentReference` instance, the provided converter will convert between Firestore data and your custom type `U`. Signature: ```typescript withConverter(converter: FirestoreDataConverter): DocumentReference; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | converter | [FirestoreDataConverter](./firestore_lite.firestoredataconverter.md)<U> | Converts objects to and from Firestore. | Returns: [DocumentReference](./firestore_lite.documentreference.md)<U> A `DocumentReference` that uses the provided converter.