visitdata.js emulates the source, medium, campaign, content and term data just like Google Analytics does it (ga.js).

Since there is no way to extract this information from ga.js directly, you need a library like visitdata.js to do it.

If you have any questions for this, drop me an email at ilkkapel@gmail.com

Here's the file you can include in your web page directly from CDN: https://cdn.jsdelivr.net/npm/visitdata/dist/visitdata.umd.js

npm install visitdata

clone this repository and then

npm install
npm run build

the javascript you need is at dist/visitdata.js

<script src="https://cdn.jsdelivr.net/npm/visitdata/dist/visitdata.umd.js"></script>
<script>console.log(visitData.get());</script>

visitdata.get() will return an object like

{
  "source": "google",
  "medium": "organic"
}

You can also run visitdata.rawData() which will return a lot more information