I'm using express 3.0 and Node v0.11.0. I have a button which submits a form and I'm using ajax to post that data as a JSON object to my node server.
The client code is:

$('#contact').submit(function(e) {
console.log('submit called');
var formData = JSON.stringify($('form').serializeObject());
console.log(formData);

$.ajax({
    url: "http://localhost:3000/savedata/",
    type: "POST",
    dataType: 'json',
    data: {objectData: formData},
    contentType: "application/json",
    complete: function() {
      console.log('process complete');
    },
    success: function(data) {
      console.log('process sucess');
    },
    error: function() {
      console.log('process error');
    },
  });
return false;
});

Then on my server:

var express = require('express');
var app = express();
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.bodyParser());
app.use(express.cookieParser());
app.use(express.static(__dirname + '/public', {maxAge: 86400000}));
app.engine('.jade', require('jade').__express);

app.post('/savedata', function(req, res) {
  console.log('savedata called');
  console.log(req.body);
  //var resultObject = JSON.parse(req.body.objectData);
  //console.log(resultObject);
  res.end();
});

The problem that I'm facing is that when I use the express.bodyParser() middleware, I get a:

Error: Bad Request
at next (/home/captain/data/lemontreecakes/node_modules/express/node_modules/connect/lib/proto.js:125:13)
at /home/captain/data/lemontreecakes/node_modules/express/node_modules/connect/lib/middleware/bodyParser.js:54:23
at IncomingMessage. (/home/captain/data/lemontreecakes/node_modules/express/node_modules/connect/lib/middleware/json.js:74:60)
at IncomingMessage.EventEmitter.emit (events.js:92:17)
at _stream_readable.js:883:14
at process._tickCallback (node.js:415:13)

This is the console output in my browser:

submit called load.js:33
{"name":"tes","email":"[email protected]"} load.js:36
POST http://localhost:3000/savedata/ 400 (Bad Request) jquery-1.9.1.min.js:5
process error load.js:54
process complete

So I know that I'm submitting data to my server. If I remove the body parser middle ware from node server, then I get

savedata called
TypeError: Cannot read property 'objectData' of undefined

I'm thinking that I'm not sending JSON data properly to the server. Any hints will be appreciated.

I'm not completely sure if this solves the problem but try this:

$.ajax({
    ...
    data: JSON.stringify({ "objectData": formData}),
    ...