Retrieving MongoDb data for a React Component on the server

I am building a React web-app with the data for the component stored in a mongoDB instance. As I understand I need to retrieve all of the data before I render out the component. I am not sure how to do it when mongoose returns promises and data flows asynchronously. How should I pass the data to the component?

//routing.jsx    
mongoose.connect(isProd ? 'mongodb://localhost:27017/real' : 'mongodb://localhost:27017/test')
function getCourses() {
  return Course
            .find({})
            .then(docs => docs)
            .catch(err => console.log(err))
}


function loadHomeData() {
  const promises = []
  promises.push(getCourses())

  Promise.all(promises).then((data) => {
    return data
  }).catch(err => console.log(err))
}

function loadCoursesData() {

}

const ROUTES = [
  { route: '/', label: 'Home', component: <HomePage />, loadData: loadHomeData },
  { route: '/courses', label: 'Courses', component: <CoursesPage />, loadData: loadCoursesData },
]

export default ROUTES

//routing.js 

export default (app: Object) => {
  ROUTES.map(route =>
  app.get(route.route, (req, res) => {
    res.send(renderApp(req.url,route.loadData()))
  })
  )
}

//render-app.jsx
const renderApp = (location: string, data: Object) => {
  const head = Helmet.rewind()
  const appHtml = ReactDOMServer.renderToString(
    <StaticRouter location={location} context={data}>
      <App />
    </StaticRouter>

  )

via Sultan Kenjeyev