> For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt.

# renderString

Used for React String SSR to render strings, used in conjunction with `createRequestHandler`.

## Usage

```tsx title="src/entry.server.tsx"
import {
  renderString,
  createRequestHandler,
  type HandleRequest,
} from '@modern-js/runtime/ssr/server';

const handleRequest: HandleRequest = async (request, ServerRoot, options) => {
  const body = await renderString(request, <ServerRoot />, options);

  return new Response(body, {
    headers: {
      'content-type': 'text/html; charset=utf-8',
    },
  });
};

export default createRequestHandler(handleRequest);
```

## Function Signature

```ts
export type RenderString = (
  request: Request,
  serverRoot: React.ReactElement,
  optinos: RenderOptions,
) => Promise<string>;
```

## Example

```tsx title="src/entry.server.tsx"
import {
  renderString,
  createRequestHandler,
  type HandleRequest,
} from '@modern-js/runtime/ssr/server';

const handleRequest: HandleRequest = async (request, ServerRoot, options) => {
  // do something before render
  const body = await renderString(request, <ServerRoot />, options);

  const newBody = body + '<div>Byte-Dance</div>';

  return new Response(newBody, {
    headers: {
      'content-type': 'text/html; charset=utf-8',
    },
  });
};

export default createRequestHandler(handleRequest);
```