[Home](./index.md) > [client](./client.md) > [HytopiaUI](./client.hytopiaui.md) > [onData](./client.hytopiaui.ondata.md) ## HytopiaUI.onData() method Registers a listener for data received by the server from `player.ui.sendData()`. **Signature:** ```typescript onData(callback: (data: object) => void): void; ``` ## Parameters

Parameter	Type	Description
callback	(data: object) => void	Function to call when data is received from the server.

**Returns:** void