We're looking for a person or people to help audit MDN to find places we could speed up. Is this you or someone you know? Check out the RFP: https://mzl.la/2IHcMiE


The type property of the OscillatorNode interface specifies what shape of waveform the oscillator will output. There are several common waveforms available, as well as an option to specify a custom waveform shape. The shape of the waveform will affect the tone that is produced.


OscillatorNode.type = type;


A DOMString specifying the shape of oscillator wave. The different available values are:

A sine wave. This is the default value.
A square wave with a duty cycle of 0.5; that is, the signal is "high" for half of each period.
A sawtooth wave.
A triangle wave.
A custom waveform. You never set type to custom manually; instead, use the setPeriodicWave() method to provide the data representing the waveform. Doing so automatically sets the type to custom.


The value custom was specified. To set a custom waveform, just call setPeriodicWave(). Doing so automatically sets the type for you.


The following example shows basic usage of an AudioContext to create an oscillator node. For an applied example, check out our Violent Theremin demo (see app.js for relevant code).

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

// create Oscillator node
var oscillator = audioCtx.createOscillator();

oscillator.type = 'square';
oscillator.frequency.setValueAtTime(440, audioCtx.currentTime); // value in hertz


Specification Status Comment
Web Audio API
The definition of 'type' in that specification.
Working Draft  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support14 Yes25 No156
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support Yes14 Yes26 No15 ?

See also

Document Tags and Contributors

 Last updated by: MysteryPancake,