FizzBuzz nodeJS version, for academic/learning purposes.

main.js

http = require("http");
url = require("url");

fizzBuzz = function(v) {
    return (v%15===0) && "FizzBuzz"  || (v%3===0) && "Fizz" || (v%5===0) && "Buzz" || v;
};

http.createServer(function(req, res) {
    var i = parseInt(url.parse(req.url).pathname.substring(1));
    res.writeHead(200, {"Content-Type": "application/json"});
    var v = {};
    v[i] = fizzBuzz(i);
    res.end(JSON.stringify(v));
}).listen(1337, '127.0.0.1');

console.log("FizzBuzz server running on port 1337");

Just run in on nodeJS like:

$ node main.js

Open your browser and go: http://127.0.0.1:1337/