index.js

const Storyblok = require('storyblok-js-client') // npm install storyblok-js-client

const MAPI_TOKEN = "your_oauth_token"
const spaceId = 73358 // your configured space id folder
const yourFolderId = 5663791 // your parent folder

let StoryblokClient = new Storyblok({
  oauthToken: MAPI_TOKEN
})

let content = {
  "story": {
    "name": "courses",
    "slug": "courses",
    "parent_id": yourFolderId, 
    "is_folder": false,
    "is_startpage": true,
    "content": {
      "component": "course-overview",
      "stageImgDesktop": "/~/media/efcom/2017/ils/courses/overview-page/ILSU_Overview-Page_Desktop.jpg",
      "stageImgMobile": "/~/media/efcom/2017/ils/courses/overview-page/ILSU_Overview_Mobile.jpg"
    }
  },
  "publish": 1
}

StoryblokClient.post(`spaces/${spaceId}/stories/`, content)
  .then((response) => {
  console.log(response)
}).catch(error => { 
  console.log(error)
})