The read-only property MediaStreamTrack.kind returns a DOMString set to "audio" if the track is an audio track and to "video", if it is a video track. It doesn't change if the track is deassociated from its source.
var type = track.kind;
The possible values are a DOMString with on of the following values:
"audio": the track is an audio track."video": the track is a video track.| Specification | Status | Comment |
|---|---|---|
| Media Capture and Streams The definition of 'MediaStreamTrack.kind' in that specification. | Candidate Recommendation | Initial specification. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | 12 | Yes | No | Yes | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | Yes | Yes | ? | Yes | ? | Yes |
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https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamTrack/kind