How to render (print) JSX as String?

just call renderToStaticMarkup() and you should get the static html markup language generated by React.

somewhat like this:

import ReactDOMServer from 'react-dom/server';
import Element from './path/to/element/class';

const element = <Element />;

ReactDOMServer.renderToStaticMarkup(element)

here are some more docs about this:

https://facebook.github.io/react/docs/react-dom-server.html#rendertostaticmarkup