title: MapBox: How do I create a featureCollection programmatically?
body: <p>I want to create clutering in my map. When looking at guides and in the Docs, the FeatureCollection Json is always pulled from some external link. But how do I just create it programmatically as I read data from my server? I don't have it all ready in one place and it will always be changing anyway depends on the user.</p>
  
  <p>I've been stuck with this issue before and ended up using some duck tape solution, but it won't work now. Can anyone please shed some light on this please?</p>