First, most popular hit for FFT in node.js. Missing some important description of how to use.

[SephReed]

var fft = new FFT.complex(n, inverse)

What is the logic when setting n and inverse? n = number of samples? inverse = 1/n?

[SephReed]

This similar function is as close as I've come to understanding the parameters: http://mathjs.org/docs/datatypes/complex_numbers.html

But it's complex numbers have a real and imaginary aspect, rather than an n and inverse aspect.

[flarn2006]

I can't even find the fft.js file. Is there one? 🤔

[SephReed]

Oh man. I don't remember, but I think it might be this:
https://github.com/jensnockert/fft.js/blob/master/lib/real.js