Frameguard: X-Frame-Options Middleware

Frameguard is an Express.js middleware designed to enhance web application security by setting the `X-Frame-Options` HTTP header. This header primarily helps mitigate clickjacking attacks by restricting whether a browser can render a page in an `<frame>`, `<iframe>`, `<embed>`, or `<object>` tag. The current stable version is 4.0.0, and its release cadence is generally tied to the broader Helmet.js project, of which it is a part, receiving updates alongside Helmet's release cycle. While the `X-Frame-Options` header is largely superseded by the more robust `frame-ancestors` Content Security Policy (CSP) directive in modern browsers, Frameguard remains valuable for providing a layer of protection against clickjacking in older browser environments that may not fully support CSP. It differentiates itself by offering a simple, focused implementation for the most common and secure directives: `DENY` (preventing any framing) and `SAMEORIGIN` (allowing framing only from the same origin).