How do I use CSRF protection with sessions in my web app?

How do I use CSRF protection with sessions in my web app?

To use CSRF protection with sessions, you can implement the csurf middleware in your Express app. First, install it using npm.

What steps do I need to follow after installing csurf?

After installing, you need to set up the middleware in your app, configure it with your session management, and ensure that you send the CSRF token in your forms.

Can you show me a code example?

Sure! Here's a basic example:

const csurf = require('csurf');
const csrfProtection = csurf({ cookie: true });

app.use(csrfProtection);

app.get('/form', (req, res) => {
  res.send(`<form action="/submit" method="POST">
    <input type="hidden" name="_csrf" value="${req.csrfToken()}">
    <button type="submit">Submit</button>
  </form>`);
});

What if I want to use it with AJAX requests?

For AJAX requests, you need to include the CSRF token in the headers. You can retrieve it from a meta tag or directly from the server response.