Convert OSM Bbox to GeoJSON

to_geojson.js

// OSM context
// const boundingBox = window.context.map().extent().bbox();
// const west = boundingBox.minX;
// const east = boundingBox.maxX;
// const north = boundingBox.maxY;
// const south = boundingBox.minY;

east=103.95809871524841
north=1.3401293903131355
south=1.3292472996510163
west=103.92966431487436

const convert = () => {
  const feature = {
    "type": "Feature",
    "properties": {},
    "geometry": {
      "type": "Polygon",
      "coordinates": [
        [[west,south],
        [east,south],
        [east,north],
        [west,north],
        [west,south]]
      ]
    }
  }
  featureCollection = {
    "type": "FeatureCollection",
    "features": [feature]
  }
  return featureCollection
}

console.log(JSON.stringify(convert().features[0]))

copy(convert().features[0])