Management Plugin enabled by default at http://localhost:15672

To have launchd start rabbitmq now and restart at login:
brew services start rabbitmq

if you don’t want/need a background service you can just run:
rabbitmq-server

==> Summary
🍺 /usr/local/Cellar/rabbitmq/3.7.15: 236 files, 14.4MB, built in 4 minutes 47 seconds