Awesome

MIDI Converter

Installing:

npm install midi-converter

Converting from MIDI to JSON:

var fs = require('fs');
var midiConverter = require('midi-converter');
var midiSong = fs.readFileSync('example.mid', 'binary');
var jsonSong = midiConverter.midiToJson(midiSong);
fs.writeFileSync('example.json', JSON.stringify(jsonSong));

Converting from JSON to MIDI:

var fs = require('fs');
var midiConverter = require('midi-converter');
var jsonSong = require('./example.json');
var midiSong = midiConverter.jsonToMidi(jsonSong);
fs.writeFileSync('example.mid', midiSong, 'binary');