Cookie not reading or setting properly

So I have a route in my Express app with two middleware in them:

app.foo('/thisRoute', fancyMiddleware.one, fancyMiddleware.two);

Both middlwares function in order just fine. However, in fancyMiddleware.one I have this:

var one = function(req, res, next) {
 ...
 ...
 res.cookie('myCookie', data, {maxAge: 3600000});

 console.log(req.cookies.myCookie)

 return next();
}

To test everything I'm using PostMan to test all my requests.

The logged output for req.cookies.myCookie always returns undefined. But in the Body tab I can see that the cookie is present.

If I log out the same cookie in fancyMiddleware.two its also undefined.

why is this returning undefined?

EDIT: So, with a few answers of "why" being given, I now realize I should have also asked:

How do I read the cookie I just set?

I dont really need it right after I set it in fancyMiddleware.one, but I do need it in fancyMiddleware.two

EDIT 2: I forgot to mention I'm working with an Express 3 setup. Probably relevant.

You are setting the cookie on the response-object res, but you are asking it from the request req.

The req.cookies is populated only once, when the cookie parser middleware is executed.

res.cookie() immediately sets the Set-Cookie header, so you'll have to use res.get('Set-Cookie') to see the current values.