Node, BodyParser bad json

I have this code in javascript:

var express = require('express');

var bodyParser = require('body-parser');
var app = express();

app.use(bodyParser.json());

app.post('/test', function (req, res) {
console.log(req.body);
})

var server = app.listen(8080, function () {
})

From a rails app I am suppose to receive this json in the body:

 {"content": "some content", "test":"some tests"}

but instead I receive this one:

{ '{"content":"some content","test":"some test"}' : ''}

Any idea of what I am doing wrong??

This is the way the JSON is sent:

Hi, this is the way the JSON is sent:

response = JSON.parse RestClient.post("#{test_runner_url}/test", {content: content, test: test}.to_json)