[Home](./index.md) > [@firebase/database](./database.md) > [DataSnapshot](./database.datasnapshot.md) > [key](./database.datasnapshot.key.md) ## DataSnapshot.key property The key (last part of the path) of the location of this `DataSnapshot`. The last token in a Database location is considered its key. For example, "ada" is the key for the /users/ada/ node. Accessing the key on any `DataSnapshot` will return the key for the location that generated it. However, accessing the key on the root URL of a Database will return `null`. Signature: ```typescript get key(): string | null; ```