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This user session that we've created isn't a real unique identifier; it's a simplified example for the purpose of demonstrating how cookies work in Express. To get a better user session, we should use the popular middleware express-session instead of our custom implementation:

npm install express-session --save

express-session provides a lot of additional functionalities to manage user sessions, including using unique identifiers and support for writing user sessions to database stores. It's very easy to convert to using express-session, simply replace our custom session import with the express-session module instead, and then configure it to use the following secret and configuration options:

...var session = require('express-session' ...