Where is session store ? (ExpressJS)

Question

I'm learning ExpressJS, and I want to make a Register-Login system.

I'm reading about express-session and it seems kind of easy to use but I wonder,

by default, where does it store session for each user ?
And when do those session get deleted ?

Can U guys give me some blog post about this ? Thank U

If you don't use external store, it is stored in memory. And when you restart the app, it will be lost. — Abhyudit Jain, Jan 10 '18 at 04:59
refer this, https://stackoverflow.com/questions/4526349/where-are-the-session-variables-saved — Dheeraj Sharma, Jan 10 '18 at 05:02

score 10 · Accepted Answer · edited Jun 20 '20 at 09:12

If you don't supply express-session with a storage mechanism, then it just uses a lightweight memory store. Thus, it is not persisted across server restarts.

From the doc:

store

The session store instance, defaults to a new MemoryStore instance.

The MemoryStore comes with these warnings:

Warning The default server-side session storage, MemoryStore, is purposely not designed for a production environment. It will leak memory under most conditions, does not scale past a single process, and is meant for debugging and developing.

For a list of stores, see compatible session stores.

Where is session store ? (ExpressJS)

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