Express 4 Sessions not persisting when restarting server

Question

I have an Express 4 app setup to have sessions.

// Sessions
app.use(cookieParser());
app.use(session({ secret: "some-secret" }));

// Signup
app.post("/signup", function (req, res) {
    create_user(req.body.user, function (err, user_id) {
        req.session.user_id = user_id;
        res.redirect("/admin");
    });
});

When I submit the form, it saves the user_id to the req.session. However, when I restart the server, the session is gone.

Why isn't it persisting? Am I missing some configuration?

Answer 1

The default session store for express-session is MemoryStore, which as the name suggests, stores sessions in memory only. If you need persistence, there are many session stores available for Express. Some examples:

• Cookie store
• Redis store
• MongoDB store
• CouchDB store
• Riak store
• memcached store
• leveldb store
• MySQL store
• PostgreSQL store
• Firebase store

For a updated and more complete list visit Compatible Session Stores.

Answer 2

@mscdex answer is great but in case you are looking for code samples. Here is one with connect-mongo which should work fine if you mongodb and mongoose.

Install the package:

npm i connect-mongo

require the package:

const session = require('express-session'); // You must have express-sessions installed
const MongoStore = require('connect-mongo')(session)

Now configure the session:

app.use(
  session({
    secret: "mysecrets",
    resave: false,
    saveUninitialized: false,
    store: new MongoStore({ 
      mongooseConnection: mongoose.connection,
      ttl: 14 * 24 * 60 * 60
     }),

  })
);

Again this assumes you are using mongoose and have the connection configured.

If you did everything right, it should work just fine.