JS code snippet of geojson into leaflet layers.

gistfile1.js

    jQuery.each(marketAreas, function (key, marketArea) {
      parsedMarketArea = {
        'type': 'Feature',
        'properties' : marketArea.properties,
        'geometry' :  jQuery.parseJSON(marketArea.geometry)
      };
      maOverlayGroups[marketArea.properties.title] = L.geoJson(parsedMarketArea, {
        'style': mapPolygonSettings,
        'onEachFeature': function (feature, layer) {
          var area_content = themeString(
            area_theme,
            '/node/' + feature.properties.nid,
            feature.properties.title
          );
          layer.bindPopup(area_content, {className: 'map-popup'});
        }
      });
      //maOverlayGroups[marketArea.properties.title] = new L.layerGroup().addTo(map);
      maOverlays[marketArea.properties.title] = maOverlayGroups[marketArea.properties.title];
    });
    var controlMarketAreas, controlMarketAreasDiv;
    L.control.layers(null, maOverlays, {
      collapsed: true
    }).addTo(map);