[Home](./index.md) > [puppeteer](./puppeteer.md) > [CDPSession](./puppeteer.cdpsession.md) > [\_onMessage](./puppeteer.cdpsession._onmessage.md) ## CDPSession.\_onMessage() method Signature: ```typescript _onMessage(object: CDPSessionOnMessageObject): void; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | object | CDPSessionOnMessageObject | | Returns: void