Nodejs callback response not working as expected - angularjs

Question

I'm trying to authenticate a user based on values entered in a given form. However, after using res.send(), the function at AngularJS controller is not able to correctly redirect user even if the password and username are correct. Am I handling the callbacks correctly?
Controller
<script>
var app = angular.module('myApp', []);
app.controller("loginController", function($scope,$http) {
$scope.sub = function() {
var config = {
headers : {
'Content-Type': 'application/x-www-form-
urlencoded;charset=utf-8;'
}
}
$http.post('/login', { data:{ username: $scope.username,
password: $scope.password} })
.then(function(response){
if(response.state==0){
console.log('Error!');
} else if(response.state==1){
console.log('action on success');
window.location.href = '/views/success.html';}
}).catch(function(error){
console.log('action on error');
});
Authentication
var db = require('../../config');
exports.login = function(req,res){
var username = req.body.data.username;
var password = req.body.data.password;
db.query('SELECT * FROM users WHERE username = ?',[username], function
(error, results, fields){
var result = "0";
if(error) {
console.log('Code 400, Error ocurred');
}
else{
if(results.length>0){
if(results[0].password == password){
console.log('Code 200, login sucessful');
res.json({ state : 1});
}
}
else{
console.log('Code 400, Password or username invalid');
res.json({ state: 0})
}
}
});
}
server.js
var express = require('express');
var bodyParser = require('body-parser');
var morgan = require('morgan');
var db = require('./config');
var app = express();
app.use(bodyParser.urlencoded({extended:true}));
app.use(bodyParser.json());
app.use(morgan('dev'));
app.use(express.static(__dirname + '/app'));
require('./app/routes')(app);
app.listen(3000,function(err){
if(err){
console.log(err);
}
else{
console.log("Listening on port 3000");
}
});
Route.js
var auth = require('../app/middleware/authenticateUser');
module.exports = function (app) {
app.get('/',function(req,res){
res.sendFile(__dirname + '/views/index.html');
});
app.post('/login', function(req, res){
auth.login(req,res);
});
}
Thanks in advance!

Answer 1

You need to inject $window in your controller and then in your successful response
$window.location.href = '/views/success.html';

Answer 2

Although using the $window service is considered AngularJS best practice, I don't think this is where the problem is.
Have you tried console.log() the response object of the $http call?
Maybe the problem is because you put if(response.state) instead of if(response.data.state).