Tutorial. How to create MIDI synthesizer with MIDI API and Node JS https://medium.com/nebo-15/tutorial-how-to-create-midi-synthesizer-with-midi-api-and-node-js-48d41c162009

midi-api_step4_server.js

const binaryServer = require('binaryjs').BinaryServer;
const socket = new binaryServer({
  port: 3001,
});

socket.on('connection', (client) => {
  client.on('stream', (stream, meta) => {

    stream.on('data', (data) => {
      console.log(data);
    });

    stream.on('end', () => {
      console.log('end of stream');
    });
  });
});