[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Target](./puppeteer.protocol.target.md) > [AttachedToTargetEvent](./puppeteer.protocol.target.attachedtotargetevent.md) > [sessionId](./puppeteer.protocol.target.attachedtotargetevent.sessionid.md) ## Protocol.Target.AttachedToTargetEvent.sessionId property Identifier assigned to the session used to send/receive messages. Signature: ```typescript sessionId: SessionID; ```