> For the complete documentation index, see [llms.txt](https://docs.tss-react.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tss-react.dev/ssr/other-backends.md). # Other backends Configure SSR in in frameworks other than Next.js like for example Express.js If you find this section confusing, bear in mind that TSS is using Emotion under the hood, if you find a working configuration for Emotion, TSS will work. It's equaly true for MUI, if MUI works, TSS works, it's also true the other way around. {% hint style="warning" %} If you are using nested selectors, you may need to provide [uniq identifiers to the styleshees that uses nested selectors](/nested-selectors.md#ssr). {% endhint %} ``` yarn add @emotion/server ``` ### Single emotion cache This is the recommended approach. ```tsx import createEmotionServer from "@emotion/server/create-instance"; import { renderToString } from "react-dom/server"; import type { EmotionCache } from "@emotion/cache"; import { App, createAppCache } from "/App"; function functionInChargeOfRenderingTheHtml(res) { const { constructStyleTagsFromChunks, extractCriticalToChunks } = createEmotionServer(createAppCache()); const html = renderToString(); const styleTagsAsStr = constructStyleTagsFromChunks(extractCriticalToChunks(html)); //Some framworks, like Gatsby or Next.js, only enables you to //provide your