[Home](./index.md) > [@firebase/database](./database.md) > [DataSnapshot](./database.datasnapshot.md) > [forEach](./database.datasnapshot.foreach.md) ## DataSnapshot.forEach() method Signature: ```typescript forEach(action: (a: DataSnapshot) => boolean | void): boolean; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | action | (a: [DataSnapshot](./database.datasnapshot.md)) => boolean \| void | | Returns: boolean