Exploring techniques for retrieving Express.js session cookies on the server-side prior to sending a response

Utilizing Express-session, Connect-mongo, and PassportJS on a Node server, I have implemented the following validation function:

expressApp.post('/login', function(req, res, next) {
    passport.authenticate('login', function(err, user, info) {
                if(err) {
                    return console.log(err);
                }
                if(!user){
                    res.set('WWW-Authenticate', 'x' + info);
                    return res.send(401);
                }
                req.login(user, function(err){
                    if(err) {
                        return console.log(err);
                    }
                    //I NEED TO RETRIEVE THE OUTGOING COOKIE HERE
                    //var cookie = res.get('SET-COOKIE');

                    res.redirect('/homepage');
                });
            }
        )(req, res, next)
    }
);

In the commented section, you can see that I am attempting to access cookie information before sending a response to the client. However, I have not been able to find this data within the 'res' and 'user' objects.

Specifically, I am interested in retrieving the same string found in the 'SET-COOKIE' header of an HTTP response.

Answer №1

In the file Express-session\index.js, the SET-COOKIE header string is generated after making a call to res.redirect(..) from your own code.

If you search for the function 'setcookie', you can retrieve the raw string and modify its creation if desired. However, this currently involves customizing the internal express-session code, which may not be the most ideal solution.

UPDATE: Douglas Wilson, a contributor/developer for Express-session, has provided an alternative suggestion:

The express-session module does not offer a direct way to inspect the cookie before it is set in the Node.js HTTP response object. However, you can access it before the response is sent using the on-headers module to view the headers being sent to the client:

var onHeaders = require('on-headers');

// ... when you need to access it

onHeaders(res, function () {
  // the final headers can be viewed here to read, remove, or adjust
  console.dir(res.get('Set-Cookie'));
});

*This approach may or may not be helpful based on why you require that specific cookie.* 

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