diff --git a/atom/common/api/atom_api_asar.cc b/atom/common/api/atom_api_asar.cc
index 525af42d1cc5..0a4e3ef46f62 100644
--- a/atom/common/api/atom_api_asar.cc
+++ b/atom/common/api/atom_api_asar.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by the MIT license that can be
 // found in the LICENSE file.
 
+#include <vector>
+
 #include "atom/common/asar/archive.h"
 #include "atom/common/asar/archive_factory.h"
 #include "atom/common/native_mate_converters/file_path_converter.h"
@@ -16,13 +18,13 @@ namespace {
 
 class Archive : public mate::Wrappable {
  public:
-  static v8::Handle<v8::Value> Create(mate::Arguments* args,
+  static v8::Handle<v8::Value> Create(v8::Isolate* isolate,
                                       const base::FilePath& path) {
     static asar::ArchiveFactory archive_factory;
     scoped_refptr<asar::Archive> archive = archive_factory.GetOrCreate(path);
     if (!archive)
-      return v8::False(args->isolate());
-    return (new Archive(archive))->GetWrapper(args->isolate());
+      return v8::False(isolate);
+    return (new Archive(archive))->GetWrapper(isolate);
   }
 
  protected:
@@ -30,24 +32,24 @@ class Archive : public mate::Wrappable {
   virtual ~Archive() {}
 
   // Reads the offset and size of file.
-  v8::Handle<v8::Value> GetFileInfo(mate::Arguments* args,
+  v8::Handle<v8::Value> GetFileInfo(v8::Isolate* isolate,
                                     const base::FilePath& path) {
     asar::Archive::FileInfo info;
     if (!archive_->GetFileInfo(path, &info))
-      return v8::False(args->isolate());
-    mate::Dictionary dict(args->isolate(), v8::Object::New(args->isolate()));
+      return v8::False(isolate);
+    mate::Dictionary dict(isolate, v8::Object::New(isolate));
     dict.Set("size", info.size);
     dict.Set("offset", info.offset);
     return dict.GetHandle();
   }
 
   // Returns a fake result of fs.stat(path).
-  v8::Handle<v8::Value> Stat(mate::Arguments* args,
+  v8::Handle<v8::Value> Stat(v8::Isolate* isolate,
                              const base::FilePath& path) {
     asar::Archive::Stats stats;
     if (!archive_->Stat(path, &stats))
-      return v8::False(args->isolate());
-    mate::Dictionary dict(args->isolate(), v8::Object::New(args->isolate()));
+      return v8::False(isolate);
+    mate::Dictionary dict(isolate, v8::Object::New(isolate));
     dict.Set("size", stats.size);
     dict.Set("offset", stats.offset);
     dict.Set("isFile", stats.is_file);
@@ -56,12 +58,22 @@ class Archive : public mate::Wrappable {
     return dict.GetHandle();
   }
 
+  // Returns all files under a directory.
+  v8::Handle<v8::Value> Readdir(v8::Isolate* isolate,
+                                const base::FilePath& path) {
+    std::vector<base::FilePath> files;
+    if (!archive_->Readdir(path, &files))
+      return v8::False(isolate);
+    return mate::ConvertToV8(isolate, files);
+  }
+
   // mate::Wrappable:
   mate::ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate) {
     return mate::ObjectTemplateBuilder(isolate)
         .SetValue("path", archive_->path())
         .SetMethod("getFileInfo", &Archive::GetFileInfo)
-        .SetMethod("stat", &Archive::Stat);
+        .SetMethod("stat", &Archive::Stat)
+        .SetMethod("readdir", &Archive::Readdir);
   }
 
  private:
diff --git a/atom/common/asar/archive.cc b/atom/common/asar/archive.cc
index 296345373a90..618fbf63da36 100644
--- a/atom/common/asar/archive.cc
+++ b/atom/common/asar/archive.cc
@@ -162,4 +162,25 @@ bool Archive::Stat(const base::FilePath& path, Stats* stats) {
   return FillFileInfoWithNode(stats, header_size_, node);
 }
 
+bool Archive::Readdir(const base::FilePath& path,
+                      std::vector<base::FilePath>* list) {
+  if (!header_)
+    return false;
+
+  const base::DictionaryValue* node;
+  if (!GetNodeFromPath(path.AsUTF8Unsafe(), header_.get(), &node))
+    return false;
+
+  const base::DictionaryValue* files;
+  if (!node->GetDictionaryWithoutPathExpansion("files", &files))
+    return false;
+
+  base::DictionaryValue::Iterator iter(*files);
+  while (!iter.IsAtEnd()) {
+    list->push_back(base::FilePath::FromUTF8Unsafe(iter.key()));
+    iter.Advance();
+  }
+  return true;
+}
+
 }  // namespace asar
diff --git a/atom/common/asar/archive.h b/atom/common/asar/archive.h
index 529fb64c4a4c..37962e80536f 100644
--- a/atom/common/asar/archive.h
+++ b/atom/common/asar/archive.h
@@ -5,6 +5,8 @@
 #ifndef ATOM_COMMON_ASAR_ARCHIVE_H_
 #define ATOM_COMMON_ASAR_ARCHIVE_H_
 
+#include <vector>
+
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ -41,6 +43,9 @@ class Archive : public base::RefCounted<Archive> {
   // Fs.stat(path).
   bool Stat(const base::FilePath& path, Stats* stats);
 
+  // Fs.readdir(path).
+  bool Readdir(const base::FilePath& path, std::vector<base::FilePath>* files);
+
   base::FilePath path() const { return path_; }
   base::DictionaryValue* header() const { return header_.get(); }
 
diff --git a/atom/common/lib/asar.coffee b/atom/common/lib/asar.coffee
index 57cd5145ba13..f3ec174a638f 100644
--- a/atom/common/lib/asar.coffee
+++ b/atom/common/lib/asar.coffee
@@ -162,6 +162,36 @@ fs.readFileSync = (p, options) ->
 
   buffer = new Buffer(info.size)
   fd = fs.openSync archive.path, flag
-  fs.readSync fd, buffer, 0, info.size, info.offset
-  fs.closeSync fd
+  try
+    fs.readSync fd, buffer, 0, info.size, info.offset
+  catch e
+    throw e
+  finally
+    fs.closeSync fd
   if encoding then buffer.toString encoding else buffer
+
+readdir = fs.readdir
+fs.readdir = (p, callback) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readdir.apply this, arguments unless isAsar
+
+  archive = asar.createArchive asarPath
+  return callback throw new Error("Invalid package #{asarPath}") unless archive
+
+  files = archive.readdir filePath
+  return callback createNotFoundError(asarPath, filePath) unless files
+
+  callback undefined, files
+
+readdirSync = fs.readdirSync
+fs.readdirSync = (p) ->
+  [isAsar, asarPath, filePath] = splitPath p
+  return readdirSync.apply this, arguments unless isAsar
+
+  archive = asar.createArchive asarPath
+  throw new Error("Invalid package #{asarPath}") unless archive
+
+  files = archive.readdir filePath
+  throw createNotFoundError(asarPath, filePath) unless files
+
+  files