[Home](./index.md) > [@firebase/database](./database.md) > [goOnline](./database.goonline.md) ## goOnline() function Reconnects to the server and synchronizes the offline Database state with the server state. This method should be used after disabling the active connection with `goOffline()`. Once reconnected, the client will transmit the proper data and fire the appropriate events so that your client "catches up" automatically. Signature: ```typescript export declare function goOnline(db: FirebaseDatabase): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | db | [FirebaseDatabase](./database.firebasedatabase.md) | The instance to reconnect. | Returns: void