Mongoose error in required properties - node.js

Question

I'm connecting a Angular 2 app to MongoDB via Mongoose.
I'm trying to store some data, but i obtain an error on all required properties.
I set up a schema, serverside:
var mongoose = require("mongoose");
var Schema = mongoose.Schema;
var uniqueValidator = require("mongoose-unique-validator");
var schema = new Schema({
email: {
type: String,
required: true,
unique: true
},
password: {
type: String,
required: true
},
nome: {
type: String,
required: true
},
cognome: {
type: String,
required: true
},
dataNascita: {
type: Date
},
telefono: {
type: String
},
classifica: {
type: String
}
});
schema.plugin(uniqueValidator);
module.exports = mongoose.model("User", schema);
The user object is clearly filled:
Mongoose responds with an error:
Thanks in advance for any help.
Max
Update:
The call from a Angular service:
#Injectable()
export class AuthService {
constructor(private http: Http) {
}
addUser(utente: Utente) {
const body = JSON.stringify(utente);
return this.http.post('http://localhost:3000/utente', body)
.map((response: any) => {
console.log(response);
response.json();
})
.catch((error: Response) => Observable.throw(error.json()
));
}
}
The Moongose call:
var express = require('express');
var router = express.Router();
var User = require('../models/users');
router.post('/', function (req, res, next) {
var user = new User({
email: req.body.email,
password: req.body.password,
nome: req.body.nome,
cognome: req.body.cognome,
dataNascita: req.body.dataNascita,
telefono: req.body.telefono,
classifica: req.body.classifica
});
console.log(res);
user.save(function (err, result){
console.log(err);
console.log(res);
if (err){
return res.status(500).json({
titolo: "Errore durante il salvataggio",
errore: err
});
}
res.status(201).json({
messaggio: 'Utente salvato correttamente',
oggetto: res
});
});
});