ok, so first of all you are using node.js, wich is a runtime envirenment for js so.. it does not have the window object or the canvas, to do the thing you want to do in your code you need first to create an html5 project (wich is what you need to create a canvas and draw on it)
then i see in your code that you are trying to use p5.js wich is a js lib so you need to link it to your project to bee able to use it.
here is the link!

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/addons/p5.sound.min.js"></script>

put those before your script in the index.html file :)

and finally, your code still have some issues like in p5 the first thing you wanna do is create a canvas using the createCanvas function in setup, something like

function setup(){
  createCanvas(theWidthOfTheCanvas,theHeight)
}
function draw(){
  //and here you draw stuff
}

sorry i can't explain everything in one comment but if you want to learn it check the reference!

and if you didn't understand anything.. it's fine you just need to read the reference ;)