Home Reports


- 2 min read

Using Express Session for Authorization in Node.js Applications

img of Using Express Session for Authorization in Node.js Applications

To implement Express Session in a Node.js application, you need to follow these steps:

Install the necessary dependencies:

First install Express Session:

   npm install express express-session

Require the ‘express’ and ‘express-session’ modules in your Node.js application:

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

Set up the Express app and configure the session middleware.

You need to use ‘express-session’ middleware before setting up your routes:

   const app = express();

    secret: 'your_secret_key', // Change this to your own secret
    resave: false,
    saveUninitialized: true
  • secret: This is a string used to sign the session ID cookie. You should change it to a random string.
  • resave: Forces the session to be saved back to the session store, even if the session was never modified during the request.
  • saveUninitialized: Forces a session that is “uninitialized” to be saved to the store. A session is uninitialized when it is new but not modified.

You can now access and modify the session object in your routes. Here’s an example of a route that sets a session variable and retrieves it:

   app.get('/setSession', (req, res) => {
    req.session.username = 'user123';
    res.send('Session variable set');

app.get('/getSession', (req, res) => {
    const username = req.session.username;
    res.send('Session variable: ' + username);

In this example, /setSession sets the username session variable to 'user123', and /getSession retrieves it.

Start the Express server

   const port = 3000;
app.listen(port, () => {
    console.log(`Server is listening on port ${port}`);

Make sure to handle session persistence properly, as it can be crucial for maintaining user authentication and state across requests.