server.js

// nodejs server for upload testing

var express = require('express');
var path = require('path');
var fs = require('fs');
var app = express();

app.use(express.bodyParser({uploadDir:'./_site/assets/images'}));

app.post('/upload', function(req, res) {
    var tmp_path = req.files.upload_file.path;
    var target_path = path.resolve('_site/assets/images', req.files.upload_file.name);
    fs.rename(tmp_path, target_path, function(err) {
        if (err) throw err;
        fs.unlink(tmp_path, function() {
            if (err) throw err;
            res.send({
                success: true,
                file_path: 'assets/images/' + req.files.upload_file.name
            });
        });
    });
});

app.post('/form', function(req, res) {
    res.send({
        txt1: req.param('txt1'),
        txt2: req.param('txt2')
    });
});

module.exports = app;