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MongoDB session store for Express and Connect
JavaScript
branch: master

Readme.md

connect-mongo

MongoDB session store for Connect and Express

npm version Build Status Dependency Status

Compatibility

Usage

Express or Connect integration

Express 4.x, 5.0 and Connect 3.x:

var session = require('express-session');
var MongoStore = require('connect-mongo')(session);

app.use(session({
    secret: 'foo',
    store: new MongoStore(options)
}));

Express 2.x, 3.x and Connect 1.x, 2.x:

var MongoStore = require('connect-mongo')(express);

app.use(express.session({
    secret: 'foo',
    store: new MongoStore(options)
}));

For Connect 1.x and 2.x, just replace express by connect.

Connection to MongoDB

In many circumstances, connect-mongo will not be the only part of your application which need a connection to a MongoDB database. It could be interesting to re-use an existing connection.

Alternatively, you can configure connect-mongo to establish a new connection.

Re-use a Mongoose connection

var mongoose = require('mongoose');

// Basic usage
mongoose.connect(connectionOptions);

app.use(session({
    store: new MongoStore({ mongooseConnection: mongoose.connection })
}));

// Advanced usage
var connection = mongoose.createConnection(connectionOptions);

app.use(session({
    store: new MongoStore({ mongooseConnection: connection })
}));

Re-use a native MongoDB driver connection

In this case, you just have to give your Db instance to connect-mongo. If the connection is not opened, connect-mongo will do it for you.

/*
** There are many ways to create dbInstance.
** You should refer to the driver documentation.
*/

app.use(session({
    store: new MongoStore({ db: dbInstance })
}));

Create a new connection from a MongoDB connection string

MongoDB connection strings are the best way to configure a new connection. For advanced usage, more options can be configured with mongoOptions property.

// Basic usage
app.use(session({
    store: new MongoStore({ url: 'mongodb://localhost/test-app' })
}));

// Advanced usage
app.use(session({
    store: new MongoStore({
        url: 'mongodb://user12345:foobar@localhost/test-app?authSource=admins&w=1',
        mongoOptions: advancedOptions // See below for details
    })
}));

Create a new connection from legacy options

For compatibility purpose, connect-mongo can create a basic connection string and set some options for you.

You can't use mongoOptions if you choose this mode.

app.use(session({
    store: new MongoStore({
        // Basic usage
        host: 'localhost', // Default, optional
        port: 27017, // Default, optional
        db: 'test-app', // Required

        // Basic authentication (optional)
        username: 'user12345',
        password: 'foobar',

        // Advanced options (optional)
        autoReconnect: true, // Default
        w: 1, // Default,
        ssl: false // Default
    })
}));

Session expiration

When the session cookie has an expiration date, connect-mongo will use it.

Otherwise, it will create a new one, using ttl option.

app.use(session({
    store: new MongoStore({
      url: 'mongodb://localhost/test-app',
      ttl: 14 * 24 * 60 * 60 // = 14 days. Default
    })
}));

Note: Each time an user interacts with the server, its session expiration date is refreshed.

Remove expired sessions

By default, connect-mongo uses MongoDB's TTL collection feature (2.2+) to have mongod automatically remove expired sessions. But you can change this behavior.

Set MongoDB to clean expired sessions (default mode)

connect-mongo will create a TTL index for you at startup. You MUST have MongoDB 2.2+ and administration permissions.

app.use(session({
    store: new MongoStore({
      url: 'mongodb://localhost/test-app',
      autoRemove: 'native' // Default
    })
}));

Note: If you use connect-mongo in a very concurrent environment, you should avoid this mode and prefer setting the index yourself, once!

Set the compatibility mode

You have an older MongoDB version (compatible with connect-mongo) or you can't or don't want to create a TTL index.

connect-mongo will take care of removing expired sessions, using defined interval.

app.use(session({
    store: new MongoStore({
      url: 'mongodb://localhost/test-app',
      autoRemove: 'interval',
      autoRemoveInterval: 10 // In minutes. Default
    })
}));

Disable expired sessions cleaning

You are in production environnement and/or you manage the TTL index elsewhere.

app.use(session({
    store: new MongoStore({
      url: 'mongodb://localhost/test-app',
      autoRemove: 'disabled'
    })
}));

Lazy session update

If you are using express-session >= 1.10.0 and don't want to resave all the session on database every single time that the user refresh the page, you can lazy update the session, by limiting a period of time.

app.use(express.session({
    secret: 'keyboard cat',
    saveUninitialized: false, // don't create session until something stored
    resave: false, //don't save session if unmodified
    store: new mongoStore({
        url: 'mongodb://localhost/test-app',
        touchAfter: 24 * 3600 // time period in seconds
    })
}));

by doing this, setting touchAfter: 24 * 3600 you are saying to the session be updated only one time in a period of 24 hours, does not matter how many request's are made (with the exception of those that change something on the session data)

More options

  • collection Collection (default: sessions)
  • fallbackMemory Fallback to MemoryStore. Useful if you want to use MemoryStore in some case, like in development environment.
  • stringify If true, connect-mongo will serialize sessions using JSON.stringify before setting them, and deserialize them with JSON.parse when getting them. (optional, default: true). This is useful if you are using types that MongoDB doesn't support.
  • serialize Custom hook for serializing sessions to MongoDB. This is helpful if you need to modify the session before writing it out.
  • unserialize Custom hook for unserializing sessions from MongoDB. This can be used in scenarios where you need to support different types of serializations (e.g., objects and JSON strings) or need to modify the session before using it in your app.
  • hash (optional) Hash is an object, which will determine wether hash the sid in mongo, since it's not undefined, means sid will be hashed
  • hash.salt Salt will be used to hash the sid in mongo, default salt is "connect-mongo"
  • hash.algorithm Hash algorithm, default algorithm is "sha1"

Tests

You need mocha.

make test

The tests use a database called connect-mongo-test.

License

(The MIT License)

Copyright (c) 2011-2015 Casey Banner <kcbanner@gmail.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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