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express-session

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express-session

Simple session middleware for Express

  • 1.18.1
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  • npm
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What is express-session?

The express-session npm package is a middleware for Express applications that enables server-side session management. It allows you to store and access user data as they interact with your web application. The package creates a session ID for each client and uses it to store data across multiple HTTP requests.

What are express-session's main functionalities?

Session Initialization

This code initializes the express-session middleware with a secret to sign the session ID cookie, and configuration options such as 'resave', 'saveUninitialized', and 'cookie' settings.

const express = require('express');
const session = require('express-session');

const app = express();

app.use(session({
  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: true,
  cookie: { secure: true }
}));

Storing Session Data

This code demonstrates how to store data in the session object. The value 'This is saved in session' is stored under the key 'myValue' in the session.

app.use(session({ /* ... */ }));

app.get('/save', function(req, res) {
  // Save a value to the session
  req.session.myValue = 'This is saved in session';
  res.send('Session value stored.');
});

Retrieving Session Data

This code shows how to retrieve data from the session. It accesses the value stored under the key 'myValue' and sends it in the HTTP response.

app.get('/retrieve', function(req, res) {
  // Retrieve a value from the session
  const myValue = req.session.myValue;
  res.send(`Session value: ${myValue}`);
});

Destroying a Session

This code provides an example of how to destroy a session, effectively logging out the user. It handles any errors that might occur during the destruction process.

app.get('/logout', function(req, res) {
  // Destroy the session
  req.session.destroy(function(err) {
    if(err) {
      return res.send('Error destroying session');
    }
    res.send('Session destroyed');
  });
});

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Package last updated on 08 Oct 2024

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