---
name: Server-side render (SSR) a React component
---
To get started, install the canary version of `react` & `react-dom`:
```sh
# Any package manager can be used
$ bun add react@canary react-dom@canary
```
---
To render a React component to an HTML stream server-side (SSR):
```tsx
import { renderToReadableStream } from "react-dom/server";
function Component(props: { message: string }) {
return (
{props.message}
);
}
const stream = await renderToReadableStream(
,
);
```
---
Combining this with `Bun.serve()`, we get a simple SSR HTTP server:
```tsx
Bun.serve({
async fetch() {
const stream = await renderToReadableStream(
,
);
return new Response(stream, {
headers: { "Content-Type": "text/html" },
});
},
});
```
---
React `19` and later includes an [SSR optimization](https://github.com/facebook/react/pull/25597) that takes advantage of Bun's "direct" `ReadableStream` implementation. If you run into an error like `export named 'renderToReadableStream' not found`, please make sure to install the canary version of `react` & `react-dom`, or import from `react-dom/server.browser` instead of `react-dom/server`. See [facebook/react#28941](https://github.com/facebook/react/issues/28941) for more information.