index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>JSON Serialization - Map to JSON</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    #json{position:fixed;background-color:rgba(13, 13, 13, 0.5);padding:10px 10px 10px 10px;font:13px bold sans-serif;color:#fff;left:0px;top:0px;width:100%;height:140px;overflow:hidden}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.min.js"></script>
  <body>
    <div id="map" class="container"></div>
    <div id="json"></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        baseLayer: new maptalks.TileLayer('base', {
          urlTemplate: 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        }),
        layers : [
          new maptalks.VectorLayer('v', [new maptalks.Marker([-0.113049,51.498568])])
        ]
      });

      var mapJSON = map.toJSON();

      document.getElementById('json').innerHTML = JSON.stringify(mapJSON);

    </script>
  </body>
</html>
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