Code examples that accompany the MDN Web Audio documentation.
To preview the examples, clone the repository and navigate to the example you want to view.
For example, if you have Python installed, you can use the following commands to serve the audio-analyser example:
cd audio-analyser
python3 -m http.server
[!NOTE] If you’re using the built-in Python HTTP server, be sure to use at least Python version
3.10.12.
Then navigate to http://localhost:8000 in your browser.
For more information on serving files locally using different languages or technologies, see Running a simple local HTTP server.
The audio-analyser directory contains a very simple example showing a graphical visualization of an audio signal drawn with data taken from an AnalyserNode interface. Run the demo live.
The audio-basics directory contains a fun example showing a retro-style “boombox” that allows audio to be played, stereo-panned, and volume-adjusted. Run the demo live.
The audio-buffer directory contains a very simple example showing how to use an AudioBuffer interface in the Web Audio API. Run the demo live.
The audio-param directory contains some simple examples showing how to use the methods of the Web Audio API AudioParam interface. Run example live.
The audiocontext-states directory contains a simple demo of the new Web Audio API AudioContext methods, including the states property and the close(), resume(), and suspend() methods. Run the demo live.
The audioworklet directory contains an example showing how to use the AudioWorklet interface. See also the guide on background audio processing using AudioWorklet. Run the example live.
The compressor-example directory contains a simple demo to show usage of the Web Audio API BaseAudioContext.createDynamicsCompressor() method and DynamicsCompressorNode interface. Run the example live.
The create-media-stream-destination directory contains a simple example showing how the Web Audio API AudioContext.createMediaStreamDestination() method can be used to output a stream - in this case to a MediaRecorder instance - to output a sinewave to an opus file. Run the demo live.
The decode-audio-data directory contains a simple example demonstrating usage of the Web Audio API BaseAudioContext.decodeAudioData() method. View example live.
The iirfilter-node directory contains an example showing usage of an IIRFilterNode interface. Run the demo live.
The media-source-buffer directory contains a simple example demonstrating usage of the Web Audio API AudioContext.createMediaElementSource() method. View the demo live.
The multi-track directory contains an example of connecting separate independently-playable audio tracks to a single AudioDestinationNode interface. Run the example live.
The offline-audio-context directory contains a simple example to show how a Web Audio API OfflineAudioContext interface can be used to rapidly process/render audio in the background to create a buffer, which can then be used in any way you please. For more information, see https://developer.mozilla.org/en-US/docs/Web/API/OfflineAudioContext. Run example live.
The offline-audio-context-promise directory contains a simple example to show how a Web Audio API OfflineAudioContext interface can be used to rapidly process/render audio in the background to create a buffer, which can then be used in any way you please. Run the example live.
The output-timestamp directory contains an example of how the AudioContext.getOutputTimestamp() property can be used to log contextTime and performanceTime to the console. Try the demo live.
The panner-node directory contains a demo to show basic usage of the Web Audio API BaseAudioContext.createPanner() method to control audio spatialization. Run the example live.
The script-processor-node directory contains a simple demo showing how to use the Web Audio API’s ScriptProcessorNode interface to process a loaded audio track, adding a little bit of white noise to each audio sample. See the live demo.
The spatialization directory contains an example of how the various properties of a PannerNode interface can be adjusted to emulate sound in a three-dimensional space. For more information see Web audio spatialization basics. Try the live demo.
The step-sequencer directory contains a simple step-sequencer that loops and manipulates sounds based on a dial-up modem. For more information see Advanced techniques: creating sound, sequencing, timing, scheduling. See the live demo also.
The stereo-panner-node directory contains a simple example to show how the Web Audio API StereoPannerNode interface can be used to pan an audio stream. Run the example live.
The stream-source-buffer directory contains a simple example demonstrating usage of the Web Audio API MediaStreamAudioSourceNode object. View example live.
Violent theremin uses the Web Audio API to generate sound, and HTML5 canvas for a bit of pretty visualization. The colors generated depend on the pitch and gain of the current note, which are themselves dependent on the mouse pointer position.
You can view the demo live here.
The voice-change-o-matic directory contains a Web Audio API-powered voice changer and visualizer.
You can view the demo live here.