In Express.js, session management is a crucial aspect of creating interactive web applications. It allows you to store and access user data across multiple requests. This is typically done using the express-session middleware, which provides a way to set up session support in your Express.js application.

Implementing Session Middleware

To use sessions in Express.js, you need to install the express-session middleware. This can be done using npm:

Once installed, you can require and configure the middleware in your application:

The secret is a required option and is used to sign the session ID cookie, which can be a string or an array of strings. The resave option forces the session to be saved back to the session store, even if the session was never modified during the request. The saveUninitialized option forces a session that is "uninitialized" to be saved to the store.