Connect Redis

connect-redis is a Redis session store backed by node_redis, and is insanely fast :). Requires redis >= 2.0.0 for the SETEX command.

Note: connect-redis >= 2.0.0 only supports express >= 4.0.0. Use connect-redis 1.4.7 for express 3.x.

Installation

  $ npm install connect-redis

Options

A Redis client is required. An existing client can be passed directly using the client param or created for you using the host, port, or socket params.

• client An existing client created using redis.createClient()
• host Redis server hostname
• port Redis server portno
• socket Redis server unix_socket

The following additional params may be included:

• ttl Redis session TTL (expiration) in seconds
• disableTTL disables setting TTL, keys will stay in redis until evicted by other means (overides ttl)
• db Database index to use
• pass Password for Redis authentication
• prefix Key prefix defaulting to "sess:"
• unref Set true to unref the Redis client. Warning: this is an experimental feature.

Any options not included in this list will be passed to the redis createClient() method directly.

Usage

Due to express >= 4 changes, we now need to pass express-session to the function connect-redis exports in order to extend session.Store:

var session = require('express-session');
var RedisStore = require('connect-redis')(session);

app.use(session({
    store: new RedisStore(options),
    secret: 'keyboard cat'
}));

FAQ

Can I use a URL scheme to make a connection?

Since node_redis which this library wraps does not include the ability to create a client from a URL. Neither does this library. However, there's a separate module that can be used in conjunction to get this behavior.

How do I handle lost connections to Redis?

By default, the node_redis client will auto-reconnect when a connection is lost. But requests may come in during that time. In express, one way this scenario can be handled is including a "session check" after setting up a session (checking for the existence of req.session):

app.use(session( /* setup session here */ ))
app.use(function (req, res, next) {
  if (!req.session) {
    return next(new Error('oh no')) // handle error
  }
  next() // otherwise continue
})

License

MIT