How do I set up sessions in Express.js?

How do I set up sessions in Express.js?

To set up sessions in Express.js, you can use the 'express-session' middleware. First, install it using npm.

What do I need to install?

You need to install 'express-session' by running npm install express-session in your project directory.

How do I configure it in my app?

You can configure it by requiring it in your app and using it as middleware. Here's a basic example:

const session = require('express-session');
app.use(session({
  secret: 'your-secret-key',
  resave: false,
  saveUninitialized: true,
  cookie: { secure: false }
}));

What does each option mean?

The 'secret' is used to sign the session ID cookie, 'resave' determines if the session should be saved back to the session store, and 'saveUninitialized' controls whether to save uninitialized sessions.