Connect-mongo sessions not being deleted automatically

You haven't set a clear_interval for your sessions .. the connect-mongo default is -1 (or "never"):

clear_interval Interval in seconds to clear expired sessions (optional, default: -1). Values <= 0 disable expired session clearing.

Example of removing expired sessions every hour (3600s):

var sessionStore = new MongoStore({     db: 'myappsession',     clear_interval: 3600});

You should also make sure you have set a maxAge on your sessions to they actually expire (eg using 1 day):

app.use(express.session({    secret: "myappsecret",    cookie: { maxAge: 24 * 60 * 60 * 1000 },    store:sessionStore}));

I don't know from where the clear_interval options was taken but I'm looking at the code of the latest version:

class MongoStore extends Store { constructor(options) {  options = options || {}  /* Fallback */  if (options.fallbackMemory && MemoryStore) {    return new MemoryStore()  }  super(options)  /* Options */  this.ttl = options.ttl || 1209600 // 14 days  this.collectionName = options.collection || 'sessions'  this.autoRemove = options.autoRemove || 'native'  this.autoRemoveInterval = options.autoRemoveInterval || 10  this.transformFunctions = computeTransformFunctions(options, true)  // ...setAutoRemoveAsync() {  const removeQuery = {expires: {$lt: new Date()}}  switch (this.autoRemove) {    case 'native':      return this.collection.createIndex({expires: 1}, {expireAfterSeconds: 0})    case 'interval':      this.timer = setInterval(() => this.collection.remove(removeQuery, {w: 0}), this.autoRemoveInterval * 1000 * 60)      this.timer.unref()      return Promise.resolve()    default:      return Promise.resolve()  }}

So the correct way to set auto remove based on that code seems to be:

const store = new MongoStore({  url: "put db connection string here ...",  autoRemove: 'interval',       autoRemoveInterval: 60 * 24 // In minutes. Default})

I dont see any trace of a clear_interval option, so it seems to me the suggested solution would have no effect ...