JZZ: MIDI library for Node.js and web-browsers

JZZ.js allows sending, receiving and playing MIDI messages in Node.js and all major browsers in Linux, MacOS and Windows. Some features are available on iOS and Android devices.

JZZ.js enables Web MIDI API in Node.js and those browsers that don't support it, and provides additional functionality to make developer's life easier.

For the best user experience, it's highly RECOMMENDED (though not required) to install the latest version of Jazz-Plugin and browser extensions from Chrome Web Store or Mozilla Add-ons or Apple App Store.

Features

• MIDI In/Out
• User-defined MIDI nodes
• MIDI files
• MPE
• SMPTE
• Additional modules

Install

npm install jzz --save
or yarn add jzz
or get the full development version and minified scripts from Github

Note: in the (unlikely) case you get into trouble installing the midi-test module, that requires special system configuration, you can safely remove it from the devDependencies by running npm remove midi-test --save-dev.

Usage

Plain HTML

<script src="JZZ.js"></script>
//...

CDN (jsdelivr)

<script src="https://cdn.jsdelivr.net/npm/jzz"></script>       // the latest version, or
<script src="https://cdn.jsdelivr.net/npm/jzz@1.4.8"></script> // any particular version
//...

CDN (unpkg)

<script src="https://unpkg.com/jzz"></script>       // the latest version, or
<script src="https://unpkg.com/jzz@1.4.8"></script> // any particular version
//...

CommonJS (Browserify and Node.js command line applications)

var JZZ = require('jzz');
//...

AMD

require(['JZZ'], function(JZZ) {
  //...
});

TypeScript

import * as JZZ from 'jzz';
//...

Web MIDI API

(Node.js example)

var navigator = require('jzz');
navigator.requestMIDIAccess().then(onSuccess, onFail);
// ...
navigator.close(); // This will close MIDI inputs,
                   // otherwise Node.js will wait for MIDI input forever.
// In browsers the funcion is neither defined nor required.

JZZ API

MIDI Output/Input

JZZ().or('Cannot start MIDI engine!')
     .openMidiOut().or('Cannot open MIDI Out port!')
     .wait(500).send([0x90,60,127]) // note on
     .wait(500).send([0x80,60,0]);  // note off
JZZ().openMidiIn().or('Cannot open MIDI In port!')
     .and(function() { console.log('MIDI-In: ', this.name()); })
     .connect(function(msg) { console.log(msg.toString()); })
     .wait(10000).close();

Connecting MIDI nodes

var input = JZZ().openMidiIn();
var output = JZZ().openMidiOut();
var delay = JZZ.Widget({ _receive: function(msg) { this.wait(500).emit(msg); }});
input.connect(delay);
delay.connect(output);

Helpers and shortcuts

// All calls below will do the same job:
port.send([0x90, 61, 127]).wait(500).send([0x80, 61, 0]);   // arrays
port.send(0x90, 61, 127).wait(500).send(0x80, 61, 0);       // comma-separated
port.send(0x90, 'C#5', 127).wait(500).send(0x80, 'Db5', 0); // note names
port.noteOn(0, 'C#5', 127).wait(500).noteOff(0, 'B##4');    // helper functions
port.note(0, 'C#5', 127, 500);                              // another shortcut
port.ch(0).noteOn('C#5').wait(500).noteOff('C#5');          // using channels
port.ch(0).note('C#5', 127, 500);                           // using channels

Asynchronous calls

// in the environments that support async/await:
async function playNote() {
  var midi = await JZZ();
  var port = await midi.openMidiOut();
  await port.noteOn(0, 'C5', 127);
  await port.wait(500);
  await port.noteOff(0, 'C5');
  await port.close();
  console.log('done!');
}
// or:
async function playAnotherNote() {
  var port = await JZZ().openMidiOut();
  await port.noteOn(0, 'C5', 127).wait(500).noteOff(0, 'C5').close();
  console.log('done!');
}

Virtual MIDI ports

var logger = JZZ.Widget({ _receive: function(msg) { console.log(msg.toString()); }});
JZZ.addMidiOut('Console Logger', logger);

// now it can be used as a port:
var port = JZZ().openMidiOut('Console Logger');
// ...

// substitute the native MIDIAccess
// to make virtual ports visible to the Web MIDI API code:
navigator.requestMIDIAccess = JZZ.requestMIDIAccess;

Frequency / MIDI conversion

JZZ.MIDI.freq('A5'); // => 440
JZZ.MIDI.freq(69);   // => 440
JZZ.MIDI.freq(69.5); // => 452.8929841231365
// from frequency:
JZZ.MIDI.midi(440);  // => 69
JZZ.MIDI.midi(450);  // => 69.38905773230853
// or from name:
JZZ.MIDI.midi('A5'); // => 69

Additional modules

• JZZ-midi-SMF - Standard MIDI files: read / write / play
• JZZ-midi-GM - General MIDI instrument names: MIDI to string / string to MIDI
• JZZ-midi-Gear - Retrieve your MIDI device model and manufacturer
• JZZ-input-Kbd - Virtual piano controls for your MIDI projects
• JZZ-synth-Tiny - A tiny General MIDI synth implemented with the Web Audio API
• JZZ-gui-Select - MIDI Input/Output pickers
• JZZ-gui-Player - MIDI Player - ready for your page
• JZZ-gui-Karaoke - Karaoke :)
• etc... - Import third-party solutions into the JZZ framework

Testing your MIDI application

• midi-test - Virtual MIDI ports for testing MIDI applications
• web-midi-test - Fake Web MIDI API for testing Web MIDI applications
• jazz-midi-headless - MIDI for headless testing
• test-midi-files - A framework for producing test MIDI files

Check the Getting Started page and the API reference for more information...