[Home](./index.md) > [@firebase/firestore](./firestore.md) > [/](./firestore_.md) > [doc](./firestore_.doc.md) ## doc() function Gets a `DocumentReference` instance that refers to the document at the specified abosulute path. Signature: ```typescript export declare function doc(firestore: FirebaseFirestore, path: string, ...pathSegments: string[]): DocumentReference; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | firestore | [FirebaseFirestore](./firestore_.firebasefirestore.md) | A reference to the root Firestore instance. | | path | string | A slash-separated path to a document. | | pathSegments | string\[\] | Additional path segments that will be applied relative to the first argument. | Returns: [DocumentReference](./firestore_.documentreference.md)<[DocumentData](./firestore_.documentdata.md)> The `DocumentReference` instance. ## Exceptions If the final path has an odd number of segments and does not point to a document.