<ul><li>CSRF (Cross-Site Request Forgery) is a security vulnerability where an attacker tricks an authenticated user to submit malicious requests in your web application.</li><li>Two common CSRF protection patterns include Synchronizer-Token and Double-Submit Cookie, with the former being stateful and the latter being stateless.</li><li>The HMAC-signed double-submit CSRF pattern is a stateless, purely functional design that involves functions like generateRawToken, signToken, bundleToken, and unbundleToken to ensure secure token handling.</li><li>By implementing this pattern in frameworks like Express and front-end technologies like React/Vue/Angular, developers can enhance security without relying on deprecated packages.</li></ul>

Building Your Own HMAC-Signed Double-Submit CSRF

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