I do have a node.js file with this code:

var express = require('express');
var app = express();
var path = require('path');
var Chance = require('chance');

var chance = new Chance();

app.get('/get-javascript-file', function(req, res) {
    if (chance.integer({min: 1, max: 10}) == 1) {
        res.sendFile(path.join(__dirname + '/someFile.js'));
    } else {
        res.sendFile(path.join(__dirname + '/someOtherFile.js'));
    }
});

app.listen(80);

The nodejs basically based on the number the random function prints,sends as response the someFile.js or someOtherFile.js

Now, i do have a website called site.com hosted in let's say Godaddy which calls this node.js each time someone accesses the website.
How do i do that?! Any idea please? Thank you!