Express.js - get current session id

In this article, we would like to show you how to get current session id using Express.js.

Quick solution:

app.get('/path/to/endpoint', (req, res) => {
    const sessionId = req.session.id;
    // ...
});

or:

app.get('/path/to/endpoint', (req, res) => {
    const sessionId = req.sessionID;
    // ...
});

Practical example

In this example, we present how to get current session id using req.session.id and send it as a response of the HTTP GET request.

const express = require('express');          // npm install express
const session = require('express-session');  // npm install express-session

const app = express();

app.use(
    session({
        secret: 'session-secret-here',
        resave: false,
        saveUninitialized: true
    })
);

app.get('/path/to/endpoint', (req, res) => {
    const sessionId = req.session.id;
    res.send(`Session ID: ${sessionId}`);
});

app.listen(8080, () => console.log('Server started on port 8080.'));

References

1. GitHub - expressjs/session: Simple session middleware for Express