converting json to json-ld NODEJS

I just started reading about JSON-LD, I would like to know how to transform the following JSON Object to LD format.

i am using nodeJS.

What are the steps or is there any documentation I should look at?

{
 "stories":
  [
    {
     "category":"sport",
     "url":"http://url.com",
     "content":"It is also useful when building interoperable Web Services and when storing Linked Data in JSON-based document storage engines. "
    }
  ]
}

via charles okojie