proxy.js

var sys = require("sys"),
    http = require("http"),
    url = require("url"),
    querystring = require("querystring");
var apiPort = process.ARGV[2] || 8080;

var apiKey = 'YOUR KEY HERE';

http.createServer(function(req, res) {
        var jsonp = 'jsonp';
        var params = url.parse(req.url, true).query;
        var path = url.parse(req.url, true).pathname;

        function writeJSONP(contents) {
                res.writeHead(200, {
                        'Content-Type' : 'application/javascript'
                });

                res.write(jsonp + '(' + contents + ')');
                return res.end();
        }

        if (typeof params == 'undefined') {
                res.writeHead(400);
                return res.end();
        }

        if (typeof params.jsonp != 'undefined' && params.jsonp != '') {
                jsonp = (params.jsonp + '').replace(/[^a-zA-Z0-9._$]+/g, '');
        }
        delete params.jsonp;

        params.key = apiKey;
        params.format = 'json';
        
        // New 0.3.6+ http api
        var options = {
            host: 'api.steampowered.com',
            port: 80,
            path: path + '?' + querystring.stringify(params),
            method: 'GET'
        };

        var request = http.request(options, function(res) {
          results = '';
          res.on('data', function(chunk) {
            results += chunk;
          });
          res.on('end', function() {
            writeJSONP(results);
          });
        });
        request.end();
        
}).listen(apiPort);

sys.puts('Server running at http://127.0.0.1:' + apiPort);