Could someone please explain me what is the difference betweenndeachLayer and onEachFeature. It's very confusing to me. I have read the leaflet documentation and it becomes more confusing.
The Leaflet eachLayer method applies to any Layer Group. It loops on the group child layers at the time it is called only.
The onEachFeature option applies to Leaflet GeoJSON Layer Group only. It executes on the group child layers after those are created, but note that the GeoJSON Layer Group can also receive more Features later on (through its addData method), leading to creation of more child layers, each going through the onEachFeature option again as well.