Logging into an expressjs app with CORS - ajax

Question

I have expressjs sitting on a nodejs server and I have a client side cordova app making ajax requests to certain routes.
This is fine until I need to make a POST request to login using passportjs, there is a 302 redirect that takes place so I get this 302 Moved Temporarily when making this call
$('body').on('submit', '#logIn', function(e){
e.preventDefault();
var formData = $(this).serialize();
$.ajax({
url: "http://mydomain.io:3300/login",
data: JSON.stringify(formData),
type: "POST",
crossDomain: true,
dataType: "json",
async: true,
success: function(response){
alert('succeeded!');
console.log(response);
alert(response);
},
failure: function(message){
alert("failed");
console.log(message);
alert(message);
}
});
});
So my question is how is it possible using CORS to login to the app using client side ajax?

Answer 1

CORS is not your problem here.
Passport wants to redirect your user (based on the values you've passed to passport.authenticate). For instance:
app.get('/auth/facebook/callback',
passport.authenticate('facebook', { successRedirect: '/',
failureRedirect: '/login' }));
Passport will tell the browser to redirect to / or /login by returning a 302. You can remove the redirect by removing the second parameter to passport.authenticate:
app.get('/auth/facebook/callback',
passport.authenticate('facebook'));
This will call next() on successful authentication (and return 401 otherwise).
The examples here use FacebookStrategy, but it works with any strategy.