Looking for logging into the Sinopia site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Sinopia site. After that you can login as usual with your login credentials.
https://stackoverflow.com/questions/22636885/howto-publish-private-projects-to-sinopia-npm-adduser-for-private-registry-fail
https://github.com/rlidwka/sinopia/issues/329
https://github.com/verdaccio/verdaccio/issues/762
http://resolvethis.com/how-to-setup-a-private-npm-repository-with-sinopia/
https://www.npmjs.com/package/sinopia
https://blog.dylants.com/posts/20140510/creating-a-private-npm-registry-with-sinopia
https://www.groupxs.com/archives/wie-einfach-privates-npm-npmjs-repository-linux-installieren/149.html
https://medium.com/@minhdn/setup-a-free-private-npm-d533e065bc04
https://medium.com/@basitali155/sinopia-npm-server-to-maintain-private-packages-5e6fcb39b635
https://www.sitepoint.com/private-npm-packages-verdaccio/
http://perrymitchell.net/article/private-npm-repository-with-sinopia/
https://waffle.io/LD4P/sinopia
https://npm.tealeaf.ibmcloud.com/