[Home](./index.md) > [puppeteer](./puppeteer.md) > [Protocol](./puppeteer.protocol.md) > [ServiceWorker](./puppeteer.protocol.serviceworker.md) > [ServiceWorkerVersion](./puppeteer.protocol.serviceworker.serviceworkerversion.md) > [registrationId](./puppeteer.protocol.serviceworker.serviceworkerversion.registrationid.md) ## Protocol.ServiceWorker.ServiceWorkerVersion.registrationId property Signature: ```typescript registrationId: RegistrationID; ```