config.json

{
  "map": {
    "projection": "EPSG:3857",
    "units": "m",
      "center": {
        "x": 315445.640682,
        "y": 5971955.5,
        "crs": "EPSG:3857"
      },
      "zoom": 6,
    "maxExtent": [
      -20037508.34, -20037508.34,
      20037508.34, 20037508.34
    ],
    "layers": [{
        "type": "wms",
        "url": "http://osm.geobretagne.fr/gwc01/service/wms",
        "visibility": true,
        "group": "background",
        "thumbURL": "http://osm.geobretagne.fr/gwc01/service/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=osm%3Agoogle&STYLES=&SRS=EPSG%3A3857&CRS=EPSG%3A3857&TILED=true&WIDTH=256&HEIGHT=256&BBOX=-1252344.271424327%2C5009377.085697312%2C6.984919309616089e-10%2C6261721.35712164",
        "dimensions": [],
        "name": "osm:google",
        "title": "OpenStreetMap GeoBretagne",
        "description": "carte réalisée à partir de la base OpenStreetMap avec un style proche de la carte Google Maps",
        "bbox": {
          "crs": "EPSG:2154",
          "bounds": {
            "minx": 29.96875,
            "miny": 20.6046875,
            "maxx": 57.56640625,
            "maxy": -15.78203125
          }
        },
        "links": [],
        "params": {},
        "allowedSRS": {},
        "catalogURL": "https://geobretagne.fr/geonetwork/srv/fre/csw?request=GetRecordById&service=CSW&version=2.0.2&elementSetName=full&id=6d5e8af2-070e-45ab-96c0-fe7938a5d853",
        "loading": false,
        "loadingError": false
      }, {
        "type": "osm",
        "title": "Open Street Map",
        "name": "mapnik",
        "source": "osm",
        "group": "background",
        "visibility": false
      }]
  }
}