new.json

{
	"map": {
		"projection": "EPSG:900913",
		"units": "m",
		"center": {"x": 1250000.000000, "y": 5370000.000000, "crs": "EPSG:900913"},
    "zoom":5,
		"maxExtent": [
			-20037508.34, -20037508.34,
			20037508.34, 20037508.34
		],
		"layers": [
			{
				"type": "osm",
				"title": "Open Street Map",
				"name": "mapnik",
        "source": "osm",
				"group": "background",
        "visibility": true
			},
      {
        "type": "tileprovider",
        "title": "NASAGIBS Night 2012",
        "provider": "NASAGIBS.ViirsEarthAtNight2012",
        "name": "Night2012",
        "source": "nasagibs",
        "group": "background",
        "visibility": false
      },
      {
        "type": "tileprovider",
        "title": "OpenTopoMap",
        "provider": "OpenTopoMap",
        "name": "OpenTopoMap",
        "source": "OpenTopoMap",
        "group": "background",
        "visibility": false
      },
      {
        "format": "image/jpeg",
        "group": "background",
        "name": "s2cloudless:s2cloudless",
        "opacity": 1,
        "title": "Sentinel 2 Cloudless",
        "type": "wms",
        "url": [
          "https://1maps.geo-solutions.it/geoserver/wms", "https://2maps.geo-solutions.it/geoserver/wms", "https://3maps.geo-solutions.it/geoserver/wms", "https://4maps.geo-solutions.it/geoserver/wms", "https://5maps.geo-solutions.it/geoserver/wms", "https://6maps.geo-solutions.it/geoserver/wms"
        ],
        "source": "s2cloudless",
        "visibility": false,
        "singleTile": false
      },
      {
        "source": "ol",
        "group": "background",
        "title": "Empty Background",
        "fixed": true,
        "type": "empty",
        "visibility": false,
        "args": [
          "Empty Background", {
            "visibility": false
          }
        ]
      }
		]
	}
}