This repository shows how React can be used with the Express framework isomorphically; that is to use the same code on both the server and browser. This uses the comment box example from the React tutorial but in addition to rendering the comment box in the browser, it pre-renders it on the server, using the same code.
There are also a few other additions. I've set up webpack so that it bundles up the code to be used in the browser. I also didn't particularly like the JSX template render methods being in the same file as the controller code (despite what React says, they are controllers; they behave exactly the same way as Angular's controllers). And lastly since I had to server-side rendering, I've had to use a view engine. I've chose Swig as unlike Jade it uses proper HTML and so means I have one fewer language to learn (which fits into the philosophy of isomorphism).
Naturally this means all of the other server language implementations have been removed - Python, PHP etc.
The example file from the tutorial is now in a publicly-inaccessible location at src/example.js. The templates are in another file which is required from there, templates.jsx.
In the browser, the main entry point method which calls ReactDOM.render, is exported as render from example.js. This is made accessible as a window method in src/index.js, which is used as the entry script for webpack. This is all compiled into public/scripts/bundle.js which is what the browser includes. The settings for the webpack are found in webpack.config.js; several libraries like React itself and the markdown parser are set to be externals, which means they are not bundled up so that the browser can load those from a CDN (Content Delivery Network).
On the browser, example.js itself is required, after the node-jsx module is set up, in order that the JSX syntax can be understood. example.js also exports a renderServer which returns a static string after calling ReactDOMServer.renderToString from the react-dom/server module. The route for / simply calls this method and passes it as a variable to the views/index.html view.
npm install
Next, to compile the browser code into public/scripts/bundle.js:
npm run webpack-dev
Or if you want to compile it to a minified version without the source map:
npm run webpack
And then start the server:
npm start
And visit http://localhost:3000/.