Audio analysis in web browser can be easily performed by AnalyserNode of Web Audio API.
Is there something similar for Node.js?
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You might be interested in https://www.npmjs.com/package/web-audio-api
It's the web audio API for node.js, which sounds like what you're looking for. I haven't used it though, so I can't vouch for how good it is. The web audio API changes periodically, so I don't know how well that library stays in sync with the current spec.
Raphael Serota
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1I know that library. It does not currently implement the AnalyserNode. – TN. Jan 02 '15 at 08:55