[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Target](./puppeteer.protocol.target.md) > [ReceivedMessageFromTargetEvent](./puppeteer.protocol.target.receivedmessagefromtargetevent.md) > [sessionId](./puppeteer.protocol.target.receivedmessagefromtargetevent.sessionid.md) ## Protocol.Target.ReceivedMessageFromTargetEvent.sessionId property Identifier of a session which sends a message. Signature: ```typescript sessionId: SessionID; ```