index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>JSON Serialization - Map from 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:85px;overflow:hidden}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/maptalks@0.40.3/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/maptalks@0.40.3/dist/maptalks.min.js"></script>
  <body>
    <div id="map" class="container"></div>
    <div id="json"></div>

    <script>
      var mapJSON = {
        "version":"1.0",
        "options":{
          "center":{ "x":-0.113049,"y":51.49856800000001 },
          "zoom":13
        },
        "baseLayer":{
          "type":"TileLayer",
          "id":"base",
          "options":{
            "urlTemplate":"http://{s}.tile.osm.org/{z}/{x}/{y}.png",
            "subdomains":["a","b","c"]
          }
        },
        "layers":[
          {
            "type":"VectorLayer",
            "id":"v",
            "geometries":[
              {
                "feature":{
                  "type":"Feature",
                  "geometry":{
                    "type":"Point",
                    "coordinates":[-0.113049,51.498568]
                  }
                }
              }
            ]
          }
        ]
      };

      maptalks.Map.fromJSON('map', mapJSON);

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

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