无法使用Node.js和Express框架读取post参数

我有一个带有快速框架的node.js服务器.

var express = require('express');
var http = require('http');
var api_helper = require('./helpers/api_helper');
var app = express();

app.use(app.router);
app.use(express.bodyParser());
app.set('port', process.env.PORT || 8081);

app.post('/api/nodev1/users/login', function(req, res){
  var email = req.param('email', null);
  var password = req.param('password', null);
  console.log(email);console.log(password);
});

http.createServer(app).listen(app.get('port'), function(){
  console.log('Express server listening on port ' + app.get('port'));
});

当我尝试向/ api/nodev1/users/login发布请求时,我无法读取参数.我正在尝试卷曲如下:

curl -d "email=user@example2.com" -d "password=mypassword" http://localhost:8081/api/nodev1/users/login

电子邮件和密码未定义.