The numberOfInputs property of the AudioNode interface returns the number of inputs feeding the node. Source nodes are defined as nodes having a numberOfInputs property with a value of 0.


var numInputs = audioNode.numberOfInputs;


An integer ≥ 0.


const audioCtx = new AudioContext();

const oscillator = audioCtx.createOscillator();
const gainNode = audioCtx.createGain();


console.log(oscillator.numberOfInputs); // 0
console.log(gainNode.numberOfInputs); // 1
console.log(audioCtx.destination.numberOfInputs); // 1


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

Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 14Edge Full support 12Firefox Full support 25IE No support NoOpera Full support 15Safari Full support 6WebView Android Full support YesChrome Android Full support 18Edge Mobile Full support YesFirefox Android Full support 26Opera Android Full support 15Safari iOS ? Samsung Internet Android Full support Yes


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See also

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