MIDIAccess

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The MIDIAccess interface of the Web MIDI API provides methods for listing MIDI input and output devices, and obtaining access to those devices.

MIDIAccess is a transferable object.

EventTarget MIDIAccess

Instance properties

MIDIAccess.inputs Read only

Returns an instance of MIDIInputMap which provides access to any available MIDI input ports.

MIDIAccess.outputs Read only

Returns an instance of MIDIOutputMap which provides access to any available MIDI output ports.

MIDIAccess.sysexEnabled Read only

A boolean attribute indicating whether system exclusive support is enabled on the current MIDIAccess instance.

Events

statechange

Called whenever a new MIDI port is added or an existing port changes state.

Examples

The Navigator.requestMIDIAccess() method returns a promise that resolves with a MIDIAccess object. Information about the input and output ports is returned.

When a port changes state, information about that port is printed to the console.

js
navigator.requestMIDIAccess().then((access) => {
  // Get lists of available MIDI controllers
  const inputs = access.inputs.values();
  const outputs = access.outputs.values();

  access.onstatechange = (event) => {
    // Print information about the (dis)connected MIDI controller
    console.log(event.port.name, event.port.manufacturer, event.port.state);
  };
});

Specifications

Specification
Web MIDI API
# midiaccess-interface

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
MIDIAccess
inputs
outputs
statechange event
sysexEnabled

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
See implementation notes.