search engines index html5 web application with nodejs backend

I'm building an html5 web application with knockoutjs + backend rest service in nodejs (custom rest api, I'm not using express and i deliver only json data - no html).

The application is working fine like it is, but I need to get indexed by google. I populate content using ajax requests and now i need to find a solution to make those pages "visible" for search engines.

Is there any true elegant solution for this? I don't want to make another backend service(website - expressjs or php etc)

Please advice :|