lat lon to meter

function latlonToMeter(lat1, lon1, lat2, lon2) {
  const R = 6378.137
  const dLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180
  const dLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180
  const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
    Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
    Math.sin(dLon / 2) * Math.sin(dLon / 2)
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a))
  const d = R * c
  return d * 1000
}

How to convert latitude or longitude to meters?

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https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters