Snippet: Adding waypoints to a route between start and finish

[trasherdk]

Doing it programmatically, with data from some source:

const start = L.latLng(
        startingPoints[0]?.highestEl?.latlng?.lat,
        startingPoints[0]?.highestEl?.latlng?.lng);
const end =  L.latLng(
        startingPoints[0]?.lowestEl?.latlng?.lat,
        startingPoints[0]?.lowestEl?.latlng?.lng
      );
const middle =  L.latLng(
        startingPoints[0]?.middleEl?.latlng?.lat,
        startingPoints[0]?.middleEl?.latlng?.lng
      );
const instance = L.Routing.control({
    waypoints: [
     start,
      end,
    ],
  });

instance.setWaypoints([start, middle, end]);

Source: perliedman#663 (comment)

Doing it manually, using a nice UI: Adding waypoints by clicking the map example.