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connect-redis

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

Setup

npm install connect-redis express-session

Pass the express-session store into connect-redis to create a RedisStore constructor.

var session = require('express-session');
var RedisStore = require('connect-redis')(session);
 
app.use(session({
    store: new RedisStore(options),
    secret: 'keyboard cat'
}));

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
  • host Redis server hostname
  • port Redis server portno
  • socket Redis server unix_socket
  • url Redis server url

The following additional params may be included:

  • ttl Redis session TTL (expiration) in seconds. Defaults to session.maxAge (if set), or one day.
    • This may also be set to a function of the form (store, sess, sessionID) => number.
  • disableTTL Disables setting TTL, keys will stay in redis until evicted by other means (overides ttl)
  • db Database index to use. Defaults to Redis's default (0).
  • 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.
  • serializer An object containing stringify and parse methods compatible with Javascript's JSON to override the serializer used
  • logErrors Whether or not to log client errors. (default: false)
    • If true, a default logging function (console.error) is provided.
    • If a function, it is called anytime an error occurs (useful for custom logging)
    • If false, no logging occurs.
  • scanCount Value used for count parameter in Redis SCAN command (used in ids() and all() methods, defaults to 100).

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

Custom Redis clients

Clients other than node_redis will work if they support the same interface. Just pass the client instance as the client configuration option. Known supported clients include:

  • ioredis - adds support for Redis Sentinel and Cluster

FAQ

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
})

If you want to retry, here is another option.

License

MIT