Basic server with Squirrelly and Express

index.js

let express = require('express');
let path = require('path');
let app = express();
var Sqrl = require('squirrelly')

let server = app.listen(8080, function () {
    console.log("listening to requests on port 8080");
});

app.get('/:left/:right/:color', function (req, res) {
    var badge = Sqrl.renderFile(path.join(__dirname, 'template.svg'), req.params)
    res.writeHead(200, {
        "Content-Type": "image/svg+xml"
    })
    res.write(badge);
    res.end();
});