Easily convert coordinate system for GIS vector data in GeoJSON format by Proj.4 JS
//npm
npm install @node-gis/proj4geojson
//yarn
yarn add @node-gis/proj4geojson // WGS84 to EPSG:3857
const conv_geojson = fromWGS84(objGeoJson, "EPSG:3857");
// EPSG:3857 to WGS84
const conv_geojson = toWGS84(objGeoJson, "EPSG:3857");Licensed MIT