socket.io and express 4 sessions

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Here’s my solution for the following environment:

  • express 4.2.0
  • socket.io 1.1.0
  • cookie-parser 1.0.1
  • cookie-session 1.0.2

Code:

var cookieParser = require('cookie-parser')();
var session = require('cookie-session')({ secret: 'secret' };

...

app.use(cookieParser);
app.use(session);

...

io.use(function(socket, next) {
    var req = socket.handshake;
    var res = {};
    cookieParser(req, res, function(err) {
        if (err) return next(err);
        session(req, res, next);
    });
});

Then you can access the session from the socket’s handshake:

io.on('connection', function (socket) {
    console.log("Session: ", socket.handshake.session);
});

For people wondering how/why this works:

  • We send the handshake request through the cookie parser so that cookies are available
  • Then we send the handshake through session middleware as if its a normal request
  • The middleware attaches session to the request
  • We use handshake because for all intents and purposes, it is a normal request, and the parser and session middleware can deal with it properly. This is why you must access the session through the handshake

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