Many badge issuer services are built-in to educational tools (ex: Moodle, BadgeList, ForAllRubrics, TopClass, etc...), others are more enterprise focused (ex: Acclaim, NOCTI, Bestr, OpenBadgeFactory, Credly)
The ideal solution for Node.js appears to be the open source service called Badgr.
Badgr seems to be the largest public player in the Open Badges space and provides a fully featured, free service, with multiple-user management of issuer accounts, and an open API.
By using Badgr for our issuer account management, we also are supporting one of the only open source implementations of an Open Badges server!
To play with the service I set us up a Badger account here: https://badgr.io/issuer/issuers/SEbc17G0S5e3_zrR44oZ_A
If there are no objections to using Badger, or other services we want to evaluate, we can use this account as Node.js' primary issuer service and I'm happy to add other members of the CommComm / Badges Working Group as co-owners 👍