The arrayBuffer() method of the Body mixin takes a Response stream and reads it to completion. It returns a promise that resolves with an ArrayBuffer.

Syntax

response.arrayBuffer().then(function(buffer) {
  // do something with buffer
});

Parameters

None.

Returns

A promise that resolves with an ArrayBuffer.

Example

In our fetch array buffer live, we have a Play button. When pressed, the getData() function is run. Note that before playing full audio file will be downloaded. If you need to play ogg during downloading (stream it) - consider HTMLAudioElement:

new Audio(music.ogg).play()

In getData() we create a new request using the Request.Request constructor, then use it to fetch an OGG music track. We also use AudioContext.createBufferSource to create an audio buffer source.  When the fetch is successful, we read an ArrayBuffer out of the response using arrayBuffer(), decode the audio data using AudioContext.decodeAudioData, set the decoded data as the audio buffer source's buffer (source.buffer), then connect the source up to the AudioContext.destination.

Once getData() has finished running, we start the audio source playing with start(0), then disable the play button so it can't be clicked again when it is already playing (this would cause an error.)

function getData() {
  source = audioCtx.createBufferSource();

  var myRequest = new Request('viper.ogg');

  fetch(myRequest).then(function(response) {
    return response.arrayBuffer();
  }).then(function(buffer) {
    audioCtx.decodeAudioData(buffer, function(decodedData) {
      source.buffer = decodedData;
      source.connect(audioCtx.destination);
    });
  });
};

// wire up buttons to stop and play audio

play.onclick = function() {
  getData();
  source.start(0);
  play.setAttribute('disabled', 'disabled');
}

Specifications

Specification Status Comment
Fetch
The definition of 'arrayBuffer()' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

42

411

Yes

39

342

No

29

283

No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No Yes No No No No

1. From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.

2. From version 34: this feature is behind the dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.

3. From version 28: this feature is behind the Experimental Web Platform Features preference.

See also

Document Tags and Contributors

Last updated by: fscholz,