The url read-only property of the NavigationHistoryEntry interface returns the absolute URL of this history entry. If the entry corresponds to a different Document than the current one (like sameDocument property is false), and that Document was fetched with a Referrer-Policy header set to no-referrer or origin, the property returns null. If current document is not fully active, it returns an empty string.
A string representing the URL or null.
const current = navigation.currentEntry;
console.log(current.url);