github_api_markdown.js

function markdown(md){
    $.ajax({
        type: "POST",
        url: "https://api.github.com/markdown",
        contentType: "application/json",      
        data: JSON.stringify({
          "text": md,
          "mode": "gfm",
          "context": "github/gollum"
        }),
        success: function(jsonResult) {
            console.log(jsonResult);
        }
    });
}