Sometimes you just need the point coordinates for all the points in a GeoJSON. This function pulls them into an array.

createArrayOfPointCoordinates.js

function createArrayOfPointCoordinates(pointsJson) {
  let pointsCoordinatesArray = [];
  let pointsFeatures = pointsJson.features;

  for (let i = 0; i < pointsFeatures.length; i++) {
    let pointsFeature = pointsFeatures[i];
    if (pointsFeature.geometry != null) {
      let pointsFeaturesCoordinates = pointsFeature.geometry.coordinates;
      pointsCoordinatesArray.push(pointsFeaturesCoordinates);
    }
  }
  return pointsCoordinatesArray;
}