Inserts NULL - Node Js // MongoDB - node.js

Question

I don´t know why this code inserts NULL.
When the post request is sent I receive (from res.json(req.body) in index.js) an empty "{}"
I´m using NodeJs, Express 4 and MongoDB.
The name attributes in the post are the same than in the jade
template. I have two forms in the same .jade but with differents names, obviously.
This is not all code, I just put the most important and what is related to the question
App.js
var express = require('express');
var bodyParser = require('body-parser');
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/registredUsers');
var routes = require('./routes/index');
var users = require('./routes/users');
var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use('/', routes);
app.use('/users', users);
module.exports = app;
index.js
var express = require('express');
var bodyParser = require('body-parser');
router.post('/adduser', function(req, res) {
var db = req.db;
var userName = req.body.username;
var userEmail = req.body.useremail;
var userPassword = req.body.userpassword;
var collection = db.get('usercollection');
collection.insert({
username : userName,
email : userEmail,
password : userPassword
}, function (err, doc) {
if (err) {
res.send("There was a problem adding the information to the database.");
}
else {
res.json(req.body);
}
});
});
module.exports = router;

Answer 1

Have you tried putting
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/registredUsers');
At the top of your index.js and removing var db = req.db from the route.
Also, you can return the newly created document from the call back in your response.
Your index.js file would now look like this.
index.js
var express = require('express');
var bodyParser = require('body-parser');
var mongo = require('mongodb');
var monk = require('monk');
var db = monk('localhost:27017/registredUsers');
router.post('/adduser', function(req, res) {
var userName = req.body.username;
var userEmail = req.body.useremail;
var userPassword = req.body.userpassword;
var collection = db.get('usercollection');
collection.insert({
username : userName,
email : userEmail,
password : userPassword
}, function (err, doc) {
if (err) {
res.send("There was a problem adding the information to the database.");
}
else {
res.json(req.body); // <- here you could return the new object instead.
// res.json(doc);
}
});
});
module.exports = router;
edit
To assist the OP I made the following suggestion:
Hardcode var userName = 'test' and return the created document in res.json(doc) in order to test that the database is updating.