Web MIDI API for Node.js
npm install web-midi-apijs
// index.js:
module.exports = require('jzz');
`
If you are starting a new project, please consider using
jzz directly.
Other versions
- cwilso/WebMIDIAPIShim by Chris Wilson
- abudaan/WebMIDIAPIShim by Daniel van der Meer
Usage
npm install web-midi-api
`js
var navigator = require('web-midi-api');
// consider using var navigator = require('jzz');
var midi;
var inputs;
var outputs;
function onMIDIFailure(msg) {
console.log('Failed to get MIDI access - ' + msg);
process.exit(1);
}
function onMIDISuccess(midiAccess) {
midi = midiAccess;
inputs = midi.inputs;
outputs = midi.outputs;
setTimeout(testOutputs, 500);
}
function testOutputs() {
console.log('Testing MIDI-Out ports...');
outputs.forEach(function(port) {
console.log('id:', port.id, 'manufacturer:', port.manufacturer, 'name:', port.name, 'version:', port.version);
port.open();
port.send([0x90, 60, 0x7f]);
});
setTimeout(stopOutputs, 1000);
}
function stopOutputs() {
outputs.forEach(function(port) {
port.send([0x80, 60, 0]);
});
testInputs();
}
function onMidiIn(ev) {
var arr = [];
for(var i = 0; i < ev.data.length; i++) {
arr.push((ev.data[i] < 16 ? '0' : '') + ev.data[i].toString(16));
}
console.log('MIDI:', arr.join(' '));
}
function testInputs() {
console.log('Testing MIDI-In ports...');
inputs.forEach(function(port) {
console.log('id:', port.id, 'manufacturer:', port.manufacturer, 'name:', port.name, 'version:', port.version);
port.onmidimessage = onMidiIn;
});
setTimeout(stopInputs, 5000);
}
function stopInputs() {
console.log('Thank you!');
navigator.close(); // This will close MIDI inputs, otherwise Node.js will wait for MIDI input forever.
process.exit(0);
}
navigator.requestMIDIAccess().then(onMIDISuccess, onMIDIFailure);
``