Web Reference: The solution seems to be rather simple, at least this is what I plan to do: use setInterval to periodically clean up the expired sessions. MemoryStore provides all () to get the list, and we can use get () to force reading and thus expire them. To store or access session data, simply use the request property req.session, which is (generally) serialized as JSON by the store, so nested objects are typically fine. Because the default MemoryStore for express-session will lead to a memory leak due to it haven't a suitable way to make them expire. The sessions are still stored in memory, so they're not shared with other processes or services.
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