Question

I’ve found three library of session storing in MongoDB: connect-mongodb, connect-mongo, connect-session-mongo

Which is the best?

EDIT: So if I’ll use connect-mongodb I have to make two db connections. First for the session store:

var connect = require('connect')
  , Db = require('mongodb').Db
  , Server = require('mongodb').Server
  , server_config = new Server('localhost', 27017, {auto_reconnect: true, 
    native_parser: true})
  , db = new Db('test', server_config, {})
  , mongoStore = require('connect-mongodb');

connect.createServer(
  connect.bodyParser(),
  connect.cookieParser(),
  connect.session({
    cookie: {maxAge: 60000 * 20} // 20 minutes
  , secret: 'foo'
  , store: new mongoStore({db: db})
})
);

Second for my mongoose connection:

var mongoose = require('mongoose');
db = mongoose.connect('mongodb://localhost/test');
....

this is so?

Answer 1

https://github.com/masylum/connect-mongodb is listed on the 3rd party middleware (session stores) page of Connect, it has the most followers (111) and it’s actively updated (last update ~ 8 hours ago), so I would probably pick that one if I were you.

Edit:

About your second question, how to use connect-mongodb along with Mongoose, here’s an example:

var connect= require('connect'),
mongoose = require('mongoose'),
mongoStore = require('connect-mongodb'),
my_db = "mongodb://localhost/test",
db;

connect.createServer(
  ...
  connect.session({ store: mongoStore(my_db, secret: 'topsecret' }));
  ...
);

db = mongoose.connect(my_db);

Nodepad is a real app that uses Express, connect-mongodb and Mongoose, you can checkout the main app file here: https://github.com/alexyoung/nodepad/blob/master/app.js