The security headers on every response: the browser is told exactly what your site is allowed to do, so an injected script simply does not run.
Helmet sets the HTTP security headers that browsers obey. They are instructions attached to every page and every API response: where scripts may come from, whether the site may be framed by another, how the browser should treat the connection.
It closes off the common attacks that do not need a bug in your code: a script slipped into a page, your site loaded invisibly inside someone else's to steal clicks, or a browser guessing the type of a file and running it.
It costs nothing in speed and is the difference between a site that is merely working and a site that is defended.
Tell us what your business needs. We'll build the system around it.
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