Node-RED can be accessed as a web-service using a browser. A connection with the controller is mandatory and can be established using the on-board WLAN, configured as acces point, or using the wired ethernet connection. Pointing to the web-service from within the browser will provide acces to the development environment. The environment provides a clear, intuitive platform with on the left a node library (palette) in the center the control algorithms, build by the user, (flow) and on the right side a information and configuration overview.
For more information, have a look at the Node-RED website