navigator.geolocation.getCurrentPosition(position => {
  const { latitude, longitude } = position.coords;
  // Do something cool with latitude, longitude
});

const watchId = navigator.geolocation.watchPosition(position => {
  const { latitude, longitude } = position.coords;
  // Do something cool with latitude, longitude
});

navigator.geolocation.clearWatch(watchId);

async function sendPosition() {
  try {
    // Get the current position
    const position = await new Promise((resolve, reject) => {
      navigator.geolocation.getCurrentPosition(resolve, reject);
    });
    // .stringify() calls .toJSON() automatically
    const body = JSON.stringify(position, null, 2);
    // Prepare the fetch request options
    const options = {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body
    };
    // Send request
    await fetch('https://example.com/api/positions', options);
  } catch (error) {
    console.error('Error getting or sending position data:', error);
  }
}
sendPosition();