A project I played around with in 2014. The goal was simple: Control things in a web app using my hardware MIDI controller with faders and knobs. I tried two approaches:

• midibridge lib that uses a java module to connect to the hardware
• a node module that sends midi events to the browser via WebSockets

Node modules you might wanna install to get the last approach working:

• connect
• express
• http-server
• lsmidi
• midi
• midi.io
• socket.io
• sockjs

One approach I haven't tried yet: Web MIDI API