diff --git a/lib/server/validate.js b/lib/server/validate.js
index bc1317bd..83048bb4 100644
--- a/lib/server/validate.js
+++ b/lib/server/validate.js
@@ -1,38 +1,38 @@
 'use strict';
 
-var exit = require('./exit');
+const exit = require('./exit');
 
 module.exports.root = root;
 module.exports.editor = editor;
 module.exports.packer = packer;
 
 function root(dir, fn) {
-    var fs;
-    
     if (typeof dir !== 'string')
         throw Error('dir should be a string');
     
-    if (dir !== '/') {
-        fs = require('fs');
-        fs.stat(dir, function(error) {
-            if (error)
-                return exit('cloudcmd --root: %s', error.message);
-            
-            if (typeof fn === 'function')
-                fn('root:', dir);
-        });
-    }
+    if (dir === '/')
+        return;
+        
+    const fs = require('fs');
+    
+    fs.stat(dir, (error) => {
+        if (error)
+            return exit('cloudcmd --root: %s', error.message);
+        
+        if (typeof fn === 'function')
+            fn('root:', dir);
+    });
 }
 
 function editor(name) {
-    var reg = /^(dword|edward|deepword)$/;
+    const reg = /^(dword|edward|deepword)$/;
     
     if (!reg.test(name))
         exit('cloudcmd --editor: could be "dword", "edward" or "deepword" only');
 }
 
 function packer(name) {
-    var reg = /^(tar|zip)$/;
+    const reg = /^(tar|zip)$/;
     
     if (!reg.test(name))
         exit('cloudcmd --packer: could be "tar" or "zip" only');