[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [Page](./puppeteer.protocol.page.md) > [LifecycleEventEvent](./puppeteer.protocol.page.lifecycleeventevent.md) > [loaderId](./puppeteer.protocol.page.lifecycleeventevent.loaderid.md) ## Protocol.Page.LifecycleEventEvent.loaderId property Loader identifier. Empty string if the request is fetched from worker. Signature: ```typescript loaderId: Network.LoaderId; ```