async function geocode(q, viewport) {
  const params = new URLSearchParams({ q, limit: "5" });
  if (viewport) params.set("bbox", viewport.join(",")); // west,south,east,north
  const res = await fetch("https://navvo.io/api/v1/geocode/search?" + params, {
    headers: { "x-api-key": KEY },
  });
  const out = await res.json();
  if (!out.available) return []; // geocoder offline
  return out.data; // array of candidates
}

const items = await geocode("Abdali Boulevard, Amman", [35.85, 31.90, 35.99, 31.99]);
items.forEach((it) => {
  console.log(it.display_name, "→", Number(it.lon), Number(it.lat)); // [lng, lat]
});

async function reverse(lat, lon) {
  const res = await fetch(
    "https://navvo.io/api/v1/geocode/reverse?" + new URLSearchParams({ lat, lon }),
    { headers: { "x-api-key": KEY } }
  );
  const out = await res.json();
  return out.available ? out.data : null; // single result object
}

const place = await reverse(31.95, 35.91);
console.log(place.display_name); // "King Hussein Street, Al Abdali, Amman, Jordan"