WP Inspector is a Chrome extension that gives you quick access to the login link of any WordPress site, along with information about the current view type (single, page, archive) and REST API links for the current request.
Get it from the Chrome web store: https://chromewebstore.google.com/detail/wp-inspector/ilamkjihnomdekgagflnjjnkdnomcjbl
And check out the source code on GitHub: https://github.com/wpelevator/wp-inspector-browser-extension