expressjsHow can I use Express.js and Keycloak together to secure an application?

Express.js and Keycloak can be used together to secure an application by implementing authentication and authorization. The following steps should be taken:

1. Install Keycloak server and create a realm, client, and user.
2. Install the Keycloak Node.js adapter and configure it to connect to the Keycloak server.
3. Add the Keycloak middleware to the Express.js application.

Example code

const express = require('express');
const session = require('express-session');
const Keycloak = require('keycloak-connect');

const app = express();
const memoryStore = new session.MemoryStore();
const keycloak = new Keycloak({ store: memoryStore });

app.use(session({
  secret: 'some secret',
  resave: false,
  saveUninitialized: true,
  store: memoryStore
}));

app.use(keycloak.middleware());

4. Protect the Express.js routes that require authentication.

Example code

app.get('/secured', keycloak.protect(), (req, res) => {
  res.json({
    message: 'This is a secured route.'
  });
});

5. Use Keycloak to manage user roles and access rights.

Example code

app.get('/admin', keycloak.protect('realm:admin'), (req, res) => {
  res.json({
    message: 'This route is only accessible to users with the admin role.'
  });
});

6. Log out the user when the session ends.

Example code

app.get('/logout', (req, res) => {
  req.session.destroy(() => {
    req.logout();
    res.redirect('/');
  });
});

7. Start the Express.js application.

Example code

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Output example

Server is running on port 3000

Helpful links

• Keycloak Node.js Adapter
• Protecting Routes with Keycloak Middleware

Edit this code on GitHub