post.js

var qs = require("querystring");
var http = require("http");

http.createServer(function(request, response) {
  if (request.method === 'POST' || request.method === 'post') {
    withPostData(request, function(error, postData) {
      // postData is a JSON object from the http request
      console.log(error); // if there are no problems, error is just null
      console.log(postData); // if there are errors, postData is null
      // do real things with post data
    });
  } else {
    // otherwise it is *most likely* a get request, don't need data
    // do other things
  }
}).listen(8080);

withPostData = function(request, callback) {
    var body = ''; // initialize a blank body
    request.on('data', function(data) {
        body += data; // append to data
        if (body.length > 1e6) {
            request.connection.destroy();
            callback({error: "filesize too large: > 1GB"}, null);
        }
    });
    request.on('end', function() {
        callback(null, qs.parse(body)); // done reading data, parse it now.
    });
};