[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [BrowserTracker](./browser-tracker.browsertracker.md) > [setUserIdFromCookie](./browser-tracker.browsertracker.setuseridfromcookie.md) ## BrowserTracker.setUserIdFromCookie property Set the business-defined user ID for this user to the value of a cookie. Signature: ```typescript setUserIdFromCookie: (cookieName: string) => void; ```