***

id: 648c79da-ea52-4c22-b8bd-a2441413f27b
title: getSupportedConstraints
slug: /js/reference/webrtc/get-supported-constraints
description: getSupportedConstraints function in the WebRTC namespace.
max-toc-depth: 3
----------------

### getSupportedConstraints

* `Const` **getSupportedConstraints**(): `MediaTrackSupportedConstraints`

Returns a dictionary whose fields specify the constrainable properties the user agent understands.

#### Returns

`MediaTrackSupportedConstraints`

#### Example

```javascript
SignalWire.WebRTC.getSupportedConstraints();
// {
//   "aspectRatio": true,
//   "autoGainControl": true,
//   "brightness": true,
//   "channelCount": true,
//   "colorTemperature": true,
//   ...
// }
```