diff --git a/lib/index.js b/lib/index.js
index 1432345..c923b6f 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -21,6 +21,7 @@ function mongodbAppender(config) {
     var layout = config.layout || log4js.layouts.messagePassThroughLayout;
     var collectionName = config.collectionName || 'log';
     var connectionOptions = config.connectionOptions || {};
+    var metadata = config.metadata || {};
 
     function ERROR(err) {
         Error.call(this);
@@ -51,7 +52,7 @@ function mongodbAppender(config) {
             return dest;
         }
 
-        if (!src || typeof src !== 'object' || typeof src === 'function' || src instanceof Date || src instanceof RegExp ||  src instanceof mongodb.ObjectID) {
+        if (!src || typeof src !== 'object' || typeof src === 'function' || src instanceof Date || src instanceof RegExp || src instanceof mongodb.ObjectID) {
             return src;
         }
 
@@ -96,6 +97,7 @@ function mongodbAppender(config) {
                 collection.insert({
                     timestamp: loggingEvent.startTime,
                     data: loggingEvent.data,
+                    metadata: loggingEvent.metadata,
                     level: loggingEvent.level,
                     category: loggingEvent.logger.category
                 }, options);
@@ -104,6 +106,7 @@ function mongodbAppender(config) {
                 collection.insert({
                     timestamp: loggingEvent.startTime,
                     data: loggingEvent.data,
+                    metadata: loggingEvent.metadata,
                     level: loggingEvent.level,
                     category: loggingEvent.logger.category
                 }, options, function (error) {
@@ -127,18 +130,20 @@ function mongodbAppender(config) {
     // connect to mongodb
     mongodb.MongoClient.connect(config.connectionString, connectionOptions, function (err, db) {
         if (err) {
-            console.error('Error connecting to mongodb! URL: %s', config.connectionString);
+            console.error('Error connecting to mongodb');
             console.error(err);
         }
 
-        collection = db.collection(config.collectionName || 'log');
-
-        // process cache
-        cache.forEach(function (loggingEvent) {
-            setImmediate(function () {
-                insert(loggingEvent);
+        if (db && db.collection) {
+            collection = db.collection(config.collectionName || 'log', function() {
+                // process cache
+                cache.forEach(function (loggingEvent) {
+                    setImmediate(function () {
+                        insert(loggingEvent);
+                    });
+                });
             });
-        });
+        }
     });
 
     return function (loggingEvent) {
@@ -151,6 +156,7 @@ function mongodbAppender(config) {
         }
 
         loggingEvent.data = replaceKeys(loggingEvent.data);
+        loggingEvent.metadata = replaceKeys(metadata);
 
         // save in db
         insert(loggingEvent);
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
new file mode 100644
index 0000000..5a64ac6
--- /dev/null
+++ b/npm-shrinkwrap.json
@@ -0,0 +1,1227 @@
+{
+  "name": "log4js-node-mongodb",
+  "version": "2.2.1",
+  "dependencies": {
+    "abbrev": {
+      "version": "1.0.9",
+      "from": "abbrev@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "dev": true
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "from": "align-text@>=0.1.3 <0.2.0",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "dev": true
+    },
+    "amdefine": {
+      "version": "1.0.0",
+      "from": "amdefine@>=0.0.4",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.0.tgz",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "2.0.0",
+      "from": "ansi-regex@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "from": "ansi-styles@>=2.2.1 <3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.7",
+      "from": "argparse@>=1.0.2 <2.0.0",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.7.tgz",
+      "dev": true
+    },
+    "array-differ": {
+      "version": "1.0.0",
+      "from": "array-differ@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
+      "dev": true
+    },
+    "array-find-index": {
+      "version": "1.0.1",
+      "from": "array-find-index@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.1.tgz",
+      "dev": true
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "from": "array-union@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
+      "dev": true
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+    "array-uniq": {
+      "version": "1.0.3",
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+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
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+}
diff --git a/package.json b/package.json
index 0c666f4..5d39654 100644
--- a/package.json
+++ b/package.json
@@ -1,60 +1,60 @@
 {
-    "name": "log4js-node-mongodb",
-    "description": "A log4js-node log appender to write logs into MongoDB.",
-    "version": "2.2.0",
-    "homepage": "https://github.com/litixsoft/log4js-node-mongodb",
-    "repository": {
-        "type": "git",
-        "url": "https://github.com/litixsoft/log4js-node-mongodb.git"
-    },
-    "bugs": {
-        "url": "https://github.com/litixsoft/log4js-node-mongodb/issues"
-    },
-    "author": "Litixsoft GmbH <info@litixsoft.de> (http://www.litixsoft.de)",
-    "maintainers": [
-        "Andreas Krummsdorf <a.krummsdorf@litixsoft.de>"
-    ],
-    "contributors": [
-        "Max Nachlinger",
-        "Ilya Starostin",
-        "Adam Ball"
-    ],
-    "keywords": [
-        "log4js",
-        "mongo",
-        "mongodb",
-        "logging",
-        "log"
-    ],
-    "license": "MIT",
-    "licenses": [
-        {
-            "type": "MIT",
-            "url": "https://github.com/litixsoft/log4js-node-mongodb/blob/master/LICENSE"
-        }
-    ],
-    "main": "lib/index.js",
-    "scripts": {
-        "test": "grunt test",
-        "demo": "node ./test/demo.js"
-    },
-    "directories": {
-        "lib": "./lib"
-    },
-    "devDependencies": {
-        "grunt": "1.0.1",
-        "grunt-bg-shell": "^2.3.3",
-        "grunt-contrib-clean": "^1.0.0",
-        "grunt-contrib-jshint": "^1.0.0",
-        "grunt-jasmine-node": "^0.3.1",
-        "grunt-open": "^0.2.3",
-        "istanbul": "^0.4.4",
-        "jasmine-node": "1.14.5",
-        "load-grunt-tasks": "^3.5.0"
-    },
-    "dependencies": {
-        "log4js": "^0.6.38",
-        "lx-helpers": "^0.5.1",
-        "mongodb": "2.2.5"
+  "name": "log4js-node-mongodb",
+  "description": "A log4js-node log appender to write logs into MongoDB.",
+  "version": "2.2.1",
+  "homepage": "https://github.com/nearwood/log4js-node-mongodb",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/nearwood/log4js-node-mongodb.git"
+  },
+  "bugs": {
+    "url": "https://github.com/nearwood/log4js-node-mongodb/issues"
+  },
+  "author": "Litixsoft GmbH <info@litixsoft.de> (http://www.litixsoft.de)",
+  "maintainers": [
+    "Andreas Krummsdorf <a.krummsdorf@litixsoft.de>"
+  ],
+  "contributors": [
+    "Max Nachlinger",
+    "Ilya Starostin",
+    "Adam Ball"
+  ],
+  "keywords": [
+    "log4js",
+    "mongo",
+    "mongodb",
+    "logging",
+    "log"
+  ],
+  "license": "MIT",
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "https://github.com/nearwood/log4js-node-mongodb/blob/master/LICENSE"
     }
-}
\ No newline at end of file
+  ],
+  "main": "lib/index.js",
+  "scripts": {
+    "test": "grunt test",
+    "demo": "node ./test/demo.js"
+  },
+  "directories": {
+    "lib": "./lib"
+  },
+  "devDependencies": {
+    "grunt": "1.0.1",
+    "grunt-bg-shell": "^2.3.3",
+    "grunt-contrib-clean": "^1.0.0",
+    "grunt-contrib-jshint": "^1.0.0",
+    "grunt-jasmine-node": "^0.3.1",
+    "grunt-open": "^0.2.3",
+    "istanbul": "^0.4.4",
+    "jasmine-node": "1.14.5",
+    "load-grunt-tasks": "^3.5.0"
+  },
+  "dependencies": {
+    "log4js": "^0.6.38",
+    "lx-helpers": "^0.5.1",
+    "mongodb": "^2.2.19"
+  }
+}