diff --git a/config.default.js b/config.default.js
new file mode 100644
index 0000000..fbd016b
--- /dev/null
+++ b/config.default.js
@@ -0,0 +1,188 @@
+module.exports = function () {
+  return {
+    'reverseGeocodingApi': 'https://nominatim.openstreetmap.org/reverse',
+    'maxAge': 14,
+    'maxAgeAlert': 3,
+    'nodeZoom': 18,
+    'labelZoom': 13,
+    'clientZoom': 15,
+    'nodeAttr': [
+      // value can be a node attribute (1 depth) or a a function in utils/node with prefix show
+      {
+        'name': 'node.status',
+        'value': 'Status'
+      },
+      {
+        'name': 'node.gateway',
+        'value': 'Gateway'
+      },
+      {
+        'name': 'node.coordinates',
+        'value': 'GeoURI'
+      },
+      //    {
+      //      "name": "node.contact",
+      //      "value": "owner"
+      //    },
+
+      // Examples for functions
+      // {
+      //   // no name will remove first column
+      //   'value': function (d) {
+      //     var moment = require('moment');
+      //     var V = require('snabbdom').default;
+      //     return V.h('td', { props: { colSpan: 2 }, style: { background: '#49a' } },
+      //       _.t('sidebar.nodeOnline') + ' translate, ' + moment(d.firstseen).get('month') +
+      //       ' Month require libs like moment, access config ' + config.siteName);
+      //   }
+      // },
+      // {
+      //   'name': 'Neighbour first seen',
+      //   'value': function (d, nodeDict) {
+      //     return nodeDict[d.gateway_nexthop].firstseen.format() + 'access node object';
+      //   }
+      // },
+      {
+        'name': 'node.hardware',
+        'value': 'model'
+      },
+      {
+        'name': 'node.primaryMac',
+        'value': 'mac'
+      },
+      {
+        'name': 'node.firmware',
+        'value': 'Firmware'
+      },
+      {
+        'name': 'node.uptime',
+        'value': 'Uptime'
+      },
+      {
+        'name': 'node.firstSeen',
+        'value': 'FirstSeen'
+      },
+      {
+        'name': 'node.systemLoad',
+        'value': 'Load'
+      },
+      {
+        'name': 'node.ram',
+        'value': 'RAM'
+      },
+      {
+        'name': 'node.ipAddresses',
+        'value': 'IPs'
+      },
+      {
+        'name': 'node.update',
+        'value': 'Autoupdate'
+      },
+      {
+        'name': 'node.site',
+        'value': 'Site'
+      },
+      {
+        'name': 'node.clients',
+        'value': 'Clients'
+      }
+    ],
+    'supportedLocale': [
+      'en',
+      'de',
+      'fr',
+      'ru'
+    ],
+    // Color configs
+    'icon': {
+      'base': {
+        'fillOpacity': 0.6,
+        'opacity': 0.6,
+        'weight': 2,
+        'radius': 6,
+        'className': 'stroke-first'
+      },
+      'online': {
+        'color': '#1566A9',
+        'fillColor': '#1566A9'
+      },
+      'offline': {
+        'color': '#D43E2A',
+        'fillColor': '#D43E2A',
+        'radius': 3
+      },
+      'lost': {
+        'color': '#D43E2A',
+        'fillColor': '#D43E2A',
+        'radius': 4
+      },
+      'alert': {
+        'color': '#D43E2A',
+        'fillColor': '#D43E2A',
+        'radius': 5
+      },
+      'new': {
+        'color': '#1566A9',
+        'fillColor': '#93E929'
+      }
+    },
+    'client': {
+      'wifi24': 'rgba(220, 0, 103, 0.7)',
+      'wifi5': 'rgba(10, 156, 146, 0.7)',
+      'other': 'rgba(227, 166, 25, 0.7)'
+    },
+    'map': {
+      'labelNewColor': '#459c18',
+      'tqFrom': '#F02311',
+      'tqTo': '#04C714',
+      'highlightNode': {
+        'color': '#ad2358',
+        'weight': 8,
+        'fillOpacity': 1,
+        'opacity': 0.4,
+        'className': 'stroke-first'
+      },
+      'highlightLink': {
+        'weight': 4,
+        'opacity': 1,
+        'dashArray': '5, 10'
+      }
+    },
+    'forceGraph': {
+      'nodeColor': '#fff',
+      'highlightColor': 'rgba(255, 255, 255, 0.2)',
+      'labelColor': '#fff',
+      'tqFrom': '#770038',
+      'tqTo': '#dc0067'
+    },
+    'locate': {
+      'outerCircle': {
+        'stroke': false,
+        'color': '#4285F4',
+        'opacity': 1,
+        'fillOpacity': 0.3,
+        'clickable': false,
+        'radius': 16
+      },
+      'innerCircle': {
+        'stroke:': true,
+        'color': '#ffffff',
+        'fillColor': '#4285F4',
+        'weight': 1.5,
+        'clickable': false,
+        'opacity': 1,
+        'fillOpacity': 1,
+        'radius': 7
+      },
+      'accuracyCircle': {
+        'stroke': true,
+        'color': '#4285F4',
+        'weight': 1,
+        'clickable': false,
+        'opacity': 0.7,
+        'fillOpacity': 0.2
+      }
+    },
+    'cacheBreaker': '<!-- inject:cache-breaker -->'
+  };
+};
diff --git a/config.default.json b/config.default.json
deleted file mode 100644
index 9ad9529..0000000
--- a/config.default.json
+++ /dev/null
@@ -1,169 +0,0 @@
-// Gulp will remove all comments
-{
-  "reverseGeocodingApi": "https://nominatim.openstreetmap.org/reverse",
-  "maxAge": 14,
-  "maxAgeAlert": 3,
-  "nodeZoom": 18,
-  "labelZoom": 13,
-  "clientZoom": 15,
-  "nodeAttr": [
-    // value can be a node attribute (1 depth) or a a function in utils/node with prefix show
-    {
-      "name": "node.status",
-      "value": "Status"
-    },
-    {
-      "name": "node.gateway",
-      "value": "Gateway"
-    },
-    {
-      "name": "node.coordinates",
-      "value": "GeoURI"
-    },
-    //    {
-    //      "name": "node.contact",
-    //      "value": "owner"
-    //    },
-    {
-      "name": "node.hardware",
-      "value": "model"
-    },
-    {
-      "name": "node.primaryMac",
-      "value": "mac"
-    },
-    {
-      "name": "node.firmware",
-      "value": "Firmware"
-    },
-    {
-      "name": "node.uptime",
-      "value": "Uptime"
-    },
-    {
-      "name": "node.firstSeen",
-      "value": "FirstSeen"
-    },
-    {
-      "name": "node.systemLoad",
-      "value": "Load"
-    },
-    {
-      "name": "node.ram",
-      "value": "RAM"
-    },
-    {
-      "name": "node.ipAddresses",
-      "value": "IPs"
-    },
-    {
-      "name": "node.update",
-      "value": "Autoupdate"
-    },
-    {
-      "name": "node.site",
-      "value": "Site"
-    },
-    {
-      "name": "node.clients",
-      "value": "Clients"
-    }
-  ],
-  "supportedLocale": [
-    "en",
-    "de",
-    "fr",
-    "ru"
-  ],
-  // Color configs
-  "icon": {
-    "base": {
-      "fillOpacity": 0.6,
-      "opacity": 0.6,
-      "weight": 2,
-      "radius": 6,
-      "className": "stroke-first"
-    },
-    "online": {
-      "color": "#1566A9",
-      "fillColor": "#1566A9"
-    },
-    "offline": {
-      "color": "#D43E2A",
-      "fillColor": "#D43E2A",
-      "radius": 3
-    },
-    "lost": {
-      "color": "#D43E2A",
-      "fillColor": "#D43E2A",
-      "radius": 4
-    },
-    "alert": {
-      "color": "#D43E2A",
-      "fillColor": "#D43E2A",
-      "radius": 5
-    },
-    "new": {
-      "color": "#1566A9",
-      "fillColor": "#93E929"
-    }
-  },
-  "client": {
-    "wifi24": "rgba(220, 0, 103, 0.7)",
-    "wifi5": "rgba(10, 156, 146, 0.7)",
-    "other": "rgba(227, 166, 25, 0.7)"
-  },
-  "map": {
-    "labelNewColor": "#459c18",
-    "tqFrom": "#F02311",
-    "tqTo": "#04C714",
-    "highlightNode": {
-      "color": "#ad2358",
-      "weight": 8,
-      "fillOpacity": 1,
-      "opacity": 0.4,
-      "className": "stroke-first"
-    },
-    "highlightLink": {
-      "weight": 4,
-      "opacity": 1,
-      "dashArray": "5, 10"
-    }
-  },
-  "forceGraph": {
-    "nodeColor": "#fff",
-    "highlightColor": "rgba(255, 255, 255, 0.2)",
-    "labelColor": "#fff",
-    "tqFrom": "#770038",
-    "tqTo": "#dc0067"
-  },
-  "locate": {
-    "outerCircle": {
-      "stroke": false,
-      "color": "#4285F4",
-      "opacity": 1,
-      "fillOpacity": 0.3,
-      "clickable": false,
-      "radius": 16
-    },
-    "innerCircle": {
-      "stroke:": true,
-      "color": "#ffffff",
-      "fillColor": "#4285F4",
-      "weight": 1.5,
-      "clickable": false,
-      "opacity": 1,
-      "fillOpacity": 1,
-      "radius": 7
-    },
-    "accuracyCircle": {
-      "stroke": true,
-      "color": "#4285F4",
-      "weight": 1,
-      "clickable": false,
-      "opacity": 0.7,
-      "fillOpacity": 0.2
-    }
-  },
-  "cacheBreaker": "<!-- inject:cache-breaker -->"
-}
diff --git a/config.js b/config.js
new file mode 100644
index 0000000..43fe25b
--- /dev/null
+++ b/config.js
@@ -0,0 +1,119 @@
+module.exports = function () {
+  return {
+    // Variables are NODE_ID and NODE_NAME (only a-z0-9\- other chars are replaced with _)
+    'nodeInfos': [
+      {
+        'name': 'Clientstatistik',
+        'href': 'https://regensburg.freifunk.net/netz/statistik/node/{NODE_ID}/',
+        'image': 'https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-all-nodes?panelId=1&from=now-7d&var-nodeid={NODE_ID}&var-host={NODE_NAME}&width=650&height=350&theme=light&_t={TIME}',
+        'title': 'Knoten {NODE_ID} - weiteren Statistiken'
+      },
+      {
+        'name': 'Trafficstatistik',
+        'href': 'https://regensburg.freifunk.net/netz/statistik/node/{NODE_ID}/',
+        'image': 'https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-all-nodes?panelId=2&from=now-7d&var-nodeid={NODE_ID}&var-host={NODE_NAME}&width=650&height=350&theme=light&_t={TIME}',
+        'title': 'Knoten {NODE_ID} - weiteren Statistiken'
+      }
+    ],
+    'globalInfos': [
+      {
+        'name': 'Statistik',
+        'href': 'https://regensburg.freifunk.net/netz/statistik/',
+        'image': 'https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-network-wide-stats?panelId=11&from=now-1y&width=600&height=350&theme=light',
+        'title': 'Jahresstatistik - weiteren Statistiken'
+      }
+    ],
+    // Array of data provider are supported
+    'dataPath': [
+      'https://regensburg.freifunk.net/data/'
+    ],
+    'siteName': 'Freifunk Regensburg',
+    'mapLayers': [
+      {
+        'name': 'Freifunk Regensburg',
+        // Please ask Freifunk Regensburg before using its tile server c- example with retina tiles
+        'url': 'https://{s}.tiles.ffrgb.net/{z}/{x}/{y}{retina}.png',
+        'config': {
+          'maxZoom': 20,
+          'subdomains': '1234',
+          'attribution': '<a href="http://www.openmaptiles.org/" target="_blank">&copy; OpenMapTiles</a> <a href="http://www.openstreetmap.org/about/" target="_blank">&copy; OpenStreetMap contributors</a>',
+          'start': 6
+        }
+      },
+      {
+        'name': 'Freifunk Regensburg Night',
+        // Please ask Freifunk Regensburg before using its tile server - example with retina and dark tiles
+        'url': 'https://{s}.tiles.ffrgb.net/n/{z}/{x}/{y}{retina}.png',
+        'config': {
+          'maxZoom': 20,
+          'subdomains': '1234',
+          'attribution': ' <a href="http://www.openmaptiles.org/" target="_blank">&copy; OpenMapTiles</a> <a href="http://www.openstreetmap.org/about/" target="_blank">&copy; OpenStreetMap contributors</a>',
+          'mode': 'night',
+          'start': 19,
+          'end': 7
+        }
+      },
+      {
+        'name': 'OpenStreetMap.HOT',
+        'url': 'https://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png',
+        'config': {
+          'maxZoom': 19,
+          'attribution': '&copy; Openstreetmap France | &copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>'
+        }
+      },
+      {
+        'name': 'HERE',
+        // Please use your own API key - Free plan is on right side after the pay plans
+        'url': 'https://{s}.base.maps.api.here.com/maptile/2.1/maptile/newest/normal.day/{z}/{x}/{y}/256/png8?app_id=YOUR_KEY&app_code=YOUR_CODE&lg=deu',
+        'config': {
+          'attribution': 'Map &copy; 1987-2014 <a href="http://developer.here.com">HERE</a>',
+          'subdomains': '1234',
+          'maxZoom': 20
+        }
+      },
+      {
+        'name': 'Esri.WorldImagery',
+        'url': '//server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}',
+        'config': {
+          'maxZoom': 20,
+          'attribution': 'Tiles &copy; Esri &mdash; Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community'
+        }
+      },
+      {
+        'name': 'HERE.hybridDay',
+        // Please use your own API key - Free plan is on right side after the pay plans
+        'url': 'https://{s}.aerial.maps.api.here.com/maptile/2.1/maptile/newest/{variant}/{z}/{x}/{y}/256/png8?app_id=YOUR_KEY&app_code=YOUR_CODE&lg=deu',
+        'config': {
+          'attribution': 'Map &copy; 1987-2014 <a href="http://developer.here.com">HERE</a>',
+          'subdomains': '1234',
+          'variant': 'hybrid.day',
+          'maxZoom': 20
+        }
+      }
+    ],
+    // Set a visible frame
+    'fixedCenter': [
+      // Northwest
+      [
+        49.3522,
+        11.7752
+      ],
+      // Southeast
+      [
+        48.7480,
+        12.8917
+      ]
+    ],
+    'siteNames': [
+      {
+        'site': 'ffrgb-bat15',
+        'name': 'Regensburg'
+      },
+      {
+        'site': 'ffrgb',
+        'name': 'Regensburg'
+      }
+    ]
+  };
+};
+
diff --git a/config.json b/config.json
deleted file mode 100644
index 527e2ef..0000000
--- a/config.json
+++ /dev/null
@@ -1,117 +0,0 @@
-// Gulp will remove all comments
-{
-  // Variables are NODE_ID and NODE_NAME (only a-z0-9\- other chars are replaced with _)
-  "nodeInfos": [
-    {
-      "name": "Clientstatistik",
-      "href": "https://regensburg.freifunk.net/netz/statistik/node/{NODE_ID}/",
-      "image": "https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-all-nodes?panelId=1&from=now-7d&var-nodeid={NODE_ID}&var-host={NODE_NAME}&width=650&height=350&theme=light&_t={TIME}",
-      "title": "Knoten {NODE_ID} - weiteren Statistiken"
-    },
-    {
-      "name": "Trafficstatistik",
-      "href": "https://regensburg.freifunk.net/netz/statistik/node/{NODE_ID}/",
-      "image": "https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-all-nodes?panelId=2&from=now-7d&var-nodeid={NODE_ID}&var-host={NODE_NAME}&width=650&height=350&theme=light&_t={TIME}",
-      "title": "Knoten {NODE_ID} - weiteren Statistiken"
-    }
-  ],
-  "globalInfos": [
-    {
-      "name": "Statistik",
-      "href": "https://regensburg.freifunk.net/netz/statistik/",
-      "image": "https://grafana.regensburg.freifunk.net/render/dashboard-solo/db/ffrgb-network-wide-stats?panelId=11&from=now-1y&width=600&height=350&theme=light",
-      "title": "Jahresstatistik - weiteren Statistiken"
-    }
-  ],
-  // Array of data provider are supported
-  "dataPath": [
-    "https://regensburg.freifunk.net/data/"
-  ],
-  "siteName": "Freifunk Regensburg",
-  "mapLayers": [
-    {
-      "name": "Freifunk Regensburg",
-      // Please ask Freifunk Regensburg before using its tile server c- example with retina tiles
-      "url": "https://{s}.tiles.ffrgb.net/{z}/{x}/{y}{retina}.png",
-      "config": {
-        "maxZoom": 20,
-        "subdomains": "1234",
-        "attribution": "<a href=\"http://www.openmaptiles.org/\" target=\"_blank\">&copy; OpenMapTiles</a> <a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap contributors</a>",
-        "start": 6
-      }
-    },
-    {
-      "name": "Freifunk Regensburg Night",
-      // Please ask Freifunk Regensburg before using its tile server - example with retina and dark tiles
-      "url": "https://{s}.tiles.ffrgb.net/n/{z}/{x}/{y}{retina}.png",
-      "config": {
-        "maxZoom": 20,
-        "subdomains": "1234",
-        "attribution": " <a href=\"http://www.openmaptiles.org/\" target=\"_blank\">&copy; OpenMapTiles</a> <a href=\"http://www.openstreetmap.org/about/\" target=\"_blank\">&copy; OpenStreetMap contributors</a>",
-        "mode": "night",
-        "start": 19,
-        "end": 7
-      }
-    },
-    {
-      "name": "OpenStreetMap.HOT",
-      "url": "https://{s}.tile.openstreetmap.fr/hot/{z}/{x}/{y}.png",
-      "config": {
-        "maxZoom": 19,
-        "attribution": "&copy; Openstreetmap France | &copy; <a href=\"http://www.openstreetmap.org/copyright\">OpenStreetMap</a>"
-      }
-    },
-    {
-      "name": "HERE",
-      // Please use your own API key - Free plan is on right side after the pay plans
-      "url": "https://{s}.base.maps.api.here.com/maptile/2.1/maptile/newest/normal.day/{z}/{x}/{y}/256/png8?app_id=YOUR_KEY&app_code=YOUR_CODE&lg=deu",
-      "config": {
-        "attribution": "Map &copy; 1987-2014 <a href=\"http://developer.here.com\">HERE</a>",
-        "subdomains": "1234",
-        "maxZoom": 20
-      }
-    },
-    {
-      "name": "Esri.WorldImagery",
-      "url": "//server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}",
-      "config": {
-        "maxZoom": 20,
-        "attribution": "Tiles &copy; Esri &mdash; Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, Aerogrid, IGN, IGP, UPR-EGP, and the GIS User Community"
-      }
-    },
-    {
-      "name": "HERE.hybridDay",
-      // Please use your own API key - Free plan is on right side after the pay plans
-      "url": "https://{s}.aerial.maps.api.here.com/maptile/2.1/maptile/newest/{variant}/{z}/{x}/{y}/256/png8?app_id=YOUR_KEY&app_code=YOUR_CODE&lg=deu",
-      "config": {
-        "attribution": "Map &copy; 1987-2014 <a href=\"http://developer.here.com\">HERE</a>",
-        "subdomains": "1234",
-        "variant": "hybrid.day",
-        "maxZoom": 20
-      }
-    }
-  ],
-  // Set a visible frame
-  "fixedCenter": [
-    // Northwest
-    [
-      49.3522,
-      11.7752
-    ],
-    // Southeast
-    [
-      48.7480,
-      12.8917
-    ]
-  ],
-  "siteNames": [
-    {
-      "site": "ffrgb-bat15",
-      "name": "Regensburg"
-    },
-    {
-      "site": "ffrgb",
-      "name": "Regensburg"
-    }
-  ]
-}
diff --git a/gulp/config.js b/gulp/config.js
index 18d15e7..f6c5fa8 100644
--- a/gulp/config.js
+++ b/gulp/config.js
@@ -8,7 +8,7 @@ module.exports = function () {
       sass: 'scss/**/*.scss',
       javascript: ['./app.js', 'lib/**/*.js'],
       json: 'locale/*.json',
-      html: ['html/*.html', './config*.json']
+      html: ['html/*.html', './config*.js']
     },
     clean: [build + '/*.map', build + '/vendor', build + '/main.css'],
     autoprefixer: ['> 1% in DE'],
diff --git a/gulp/tasks/html.js b/gulp/tasks/html.js
index 2c1aa0e..7149d5d 100644
--- a/gulp/tasks/html.js
+++ b/gulp/tasks/html.js
@@ -1,21 +1,36 @@
 const fs = require('fs');
+
+// stringify functions https://gist.github.com/cowboy/3749767
+var stringify = function (obj, prop) {
+  var placeholder = '____PLACEHOLDER____';
+  var fns = [];
+  var json = JSON.stringify(obj, function (key, value) {
+    if (typeof value === 'function') {
+      fns.push(value);
+      return placeholder;
+    }
+    return value;
+  }, 2);
+  json = json.replace(new RegExp('"' + placeholder + '"', 'g'), function () {
+    return fns.shift();
+  });
+  return 'this["' + prop + '"] = ' + json + ';';
+};
+
 module.exports = function (gulp, plugins, config, env) {
   return function html() {
     return gulp.src(env.production() ? config.build + '/*.html' : 'html/*.html')
-      .pipe(plugins.inject(gulp.src(['config.json']), {
+      .pipe(plugins.inject(gulp.src(['config.js']), {
         starttag: '<!-- inject:config -->',
-        transform: function (filePath, customConfig) {
-          var defaultConfig = fs.readFileSync('config.default.json', 'utf8');
-          var buildConfig = Object.assign(
-            JSON.parse(JSON.minify(defaultConfig)),
-            JSON.parse(JSON.minify(customConfig.contents.toString('utf8')))
-          );
+        transform: function () {
+          delete require.cache[require.resolve('../../config.default')];
+          delete require.cache[require.resolve('../../config')];
+          var buildConfig = Object.assign({}, require('../../config.default')(), require('../../config')());
           return '<script>window.config =' +
-            JSON.stringify(buildConfig)
+            stringify(buildConfig)
               .replace('<!-- inject:cache-breaker -->',
                 Math.random().toString(12).substring(7)) +
-            ';</script>'
-          ;
+            ';</script>';
         }
       }))
       .pipe(env.production(plugins.kyhInlineSource({ compress: false })))
diff --git a/lib/infobox/node.js b/lib/infobox/node.js
index c11c50c..da0379e 100644
--- a/lib/infobox/node.js
+++ b/lib/infobox/node.js
@@ -123,7 +123,9 @@ define(['sorttable', 'snabbdom', 'd3-interpolate', 'moment', 'helper', 'utils/no
 
         config.nodeAttr.forEach(function (row) {
           var field = d[row.value];
-          if (nodef['show' + row.value] !== undefined) {
+          if (typeof row.value === 'function') {
+            field = row.value(d, nodeDict);
+          } else if (nodef['show' + row.value] !== undefined) {
             field = nodef['show' + row.value](d);
           }
 
@@ -131,9 +133,8 @@ define(['sorttable', 'snabbdom', 'd3-interpolate', 'moment', 'helper', 'utils/no
             if (typeof field !== 'object') {
               field = V.h('td', field);
             }
-
             children.push(V.h('tr', [
-              V.h('th', _.t(row.name)),
+              row.name !== undefined ? V.h('th', _.t(row.name)) : null,
               field
             ]));
           }