The Web MIDI API is available by default only in Chrome versions 43 and newer.
In earlier versions it is not enabled by default, but can be enabled as an experimental feature flag. In Chrome, load the special URL chrome://flags
and search within the page for "Enable Web MIDI API".
The options on the flags page require the browser to be restarted before they will take effect. The features hidden behind these flags are in an experimental state and are subject to change at any time, so the API in older versions may differ from what is available in Chrome 43.
Note also that the requestMIDIAccess
function is a method of window.navigator
, not directly of window
. Therefore you need to call it as navigator.requestMIDIAccess
.