diff --git a/lib/flash.js b/lib/flash.js
index a278bc1..3870866 100644
--- a/lib/flash.js
+++ b/lib/flash.js
@@ -2,7 +2,6 @@
  * Module dependencies.
  */
 var format = require('util').format;
-var isArray = require('util').isArray;
 
 
 /**
@@ -64,7 +63,7 @@ function _flash(type, msg) {
     if (arguments.length > 2 && format) {
       var args = Array.prototype.slice.call(arguments, 1);
       msg = format.apply(undefined, args);
-    } else if (isArray(msg)) {
+    } else if (Array.isArray(msg)) {
       msg.forEach(function(val){
         (msgs[type] = msgs[type] || []).push(val);
       });
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c17e574
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,25 @@
+{
+  "name": "connect-flash",
+  "version": "0.1.1",
+  "lockfileVersion": 1,
+  "dependencies": {
+    "diff": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-1.0.8.tgz",
+      "integrity": "sha1-NDJ2MI7Jkbe8giZ+1VvBQR+XFmY=",
+      "dev": true
+    },
+    "eyes": {
+      "version": "0.1.8",
+      "resolved": "https://registry.npmjs.org/eyes/-/eyes-0.1.8.tgz",
+      "integrity": "sha1-Ys8SAjTGg3hdkCNIqADvPgzCC8A=",
+      "dev": true
+    },
+    "vows": {
+      "version": "0.6.4",
+      "resolved": "https://registry.npmjs.org/vows/-/vows-0.6.4.tgz",
+      "integrity": "sha1-/w7V1lTQTTl87jLc5DhOqIy08ZM=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index bc46300..2cee0a5 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,12 @@
   "name": "connect-flash",
   "version": "0.1.1",
   "description": "Flash message middleware for Connect.",
-  "keywords": ["connect", "express", "flash", "messages"],
+  "keywords": [
+    "connect",
+    "express",
+    "flash",
+    "messages"
+  ],
   "repository": {
     "type": "git",
     "url": "git://github.com/jaredhanson/connect-flash.git"
@@ -15,18 +20,21 @@
     "email": "jaredhanson@gmail.com",
     "url": "http://www.jaredhanson.net/"
   },
-  "licenses": [ {
-    "type": "MIT",
-    "url": "http://www.opensource.org/licenses/MIT" 
-  } ],
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "http://www.opensource.org/licenses/MIT"
+    }
+  ],
   "main": "./lib",
-  "dependencies": {
-  },
+  "dependencies": {},
   "devDependencies": {
     "vows": "0.6.x"
   },
   "scripts": {
     "test": "NODE_PATH=lib node_modules/.bin/vows test/*-test.js"
   },
-  "engines": { "node": ">= 0.4.0" }
+  "engines": {
+    "node": ">= 0.4.0"
+  }
 }