--- title: Security --- # Security [MODES: framework] <br/> <br/> This is by no means a comprehensive guide, but React Router provides features to help address a few aspects under the _very large_ umbrella that is _Security_. ## `Content-Security-Policy` If you are implementing a [Content-Security-Policy (CSP)][csp] in your application, specifically one using the `unsafe-inline` directive, you will need to specify a [`nonce`][nonce] attribute on the inline `<script>` elements rendered in your HTML. Add a nonce to these two spots in [`entry.server.tsx`][entryserver]: - The [`<ServerRouter nonce>`][serverrouter] prop - This will be proxied along through React Context and used for other Framework Mode components that output `nonce`-aware elements, including [`<Scripts>`][scripts], [`<ScrollRestoration>`][scrollrestoration] - If those components specify their own `nonce` prop, it will override the `ServerRouter` value - The `nonce` options of [`renderToPipeableStream`][renderToPipeableStream]/[`renderToReadableStream`][renderToReadableStream] [csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CSP [entryserver]: ../api/framework-conventions/entry.server.tsx [nonce]: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/nonce [renderToPipeableStream]: https://react.dev/reference/react-dom/server/renderToPipeableStream [renderToReadableStream]: https://react.dev/reference/react-dom/server/renderToReadableStream [scripts]: ../api/components/Scripts [scrollrestoration]: ../api/components/ScrollRestoration [serverrouter]: ../api/framework-routers/ServerRouter