diff --git a/atom.gyp b/atom.gyp
index a86e09eea37..a69667f2af6 100644
--- a/atom.gyp
+++ b/atom.gyp
@@ -68,6 +68,10 @@
       'atom/browser/api/atom_api_window.h',
       'atom/browser/api/atom_browser_bindings.cc',
       'atom/browser/api/atom_browser_bindings.h',
+      'atom/browser/api/event.cc',
+      'atom/browser/api/event.h',
+      'atom/browser/api/event_emitter.cc',
+      'atom/browser/api/event_emitter.h',
       'atom/browser/auto_updater.cc',
       'atom/browser/auto_updater.h',
       'atom/browser/auto_updater_delegate.h',
diff --git a/atom/browser/api/event.cc b/atom/browser/api/event.cc
new file mode 100644
index 00000000000..16f464551b8
--- /dev/null
+++ b/atom/browser/api/event.cc
@@ -0,0 +1,61 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/event.h"
+
+#include "atom/common/api/api_messages.h"
+#include "atom/common/native_mate_converters/string16_converter.h"
+#include "content/public/browser/web_contents.h"
+#include "native_mate/object_template_builder.h"
+
+namespace mate {
+
+Event::Event()
+    : sender_(NULL),
+      message_(NULL),
+      prevent_default_(false) {
+}
+
+Event::~Event() {
+}
+
+ObjectTemplateBuilder Event::GetObjectTemplateBuilder(v8::Isolate* isolate) {
+  return ObjectTemplateBuilder(isolate)
+      .SetMethod("preventDefault", &Event::PreventDefault)
+      .SetMethod("sendReply", &Event::SendReply);
+}
+
+void Event::SetSenderAndMessage(content::WebContents* sender,
+                                IPC::Message* message) {
+  DCHECK(!sender_);
+  DCHECK(!message_);
+  sender_ = sender;
+  message_ = message;
+
+  Observe(sender);
+}
+
+void Event::WebContentsDestroyed(content::WebContents* web_contents) {
+  sender_ = NULL;
+  message_ = NULL;
+}
+
+void Event::PreventDefault() {
+  prevent_default_ = true;
+}
+
+bool Event::SendReply(const string16& json) {
+  if (message_ == NULL || sender_ == NULL)
+    return false;
+
+  AtomViewHostMsg_Message_Sync::WriteReplyParams(message_, json);
+  return sender_->Send(message_);
+}
+
+// static
+Handle<Event> Event::Create(v8::Isolate* isolate) {
+  return CreateHandle(isolate, new Event);
+}
+
+}  // namespace mate
diff --git a/atom/browser/api/event.h b/atom/browser/api/event.h
new file mode 100644
index 00000000000..bf22079291f
--- /dev/null
+++ b/atom/browser/api/event.h
@@ -0,0 +1,57 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_EVENT_H_
+#define ATOM_BROWSER_API_EVENT_H_
+
+#include "content/public/browser/web_contents_observer.h"
+#include "native_mate/wrappable.h"
+#include "native_mate/handle.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace mate {
+
+class Event : public Wrappable,
+              public content::WebContentsObserver {
+ public:
+  static Handle<Event> Create(v8::Isolate* isolate);
+
+  // Pass the sender and message to be replied.
+  void SetSenderAndMessage(content::WebContents* sender, IPC::Message* message);
+
+  // event.PreventDefault().
+  void PreventDefault();
+
+  // event.sendReply(json), used for replying synchronous message.
+  bool SendReply(const string16& json);
+
+  // Whether event.preventDefault() is called.
+  bool prevent_default() const { return prevent_default_; }
+
+ protected:
+  Event();
+  virtual ~Event();
+
+  // Wrappable implementations:
+  virtual ObjectTemplateBuilder GetObjectTemplateBuilder(v8::Isolate* isolate);
+
+  // content::WebContentsObserver implementations:
+  virtual void WebContentsDestroyed(content::WebContents*) OVERRIDE;
+
+ private:
+  // Replyer for the synchronous messages.
+  content::WebContents* sender_;
+  IPC::Message* message_;
+
+  bool prevent_default_;
+
+  DISALLOW_COPY_AND_ASSIGN(Event);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_EVENT_H_
diff --git a/atom/browser/api/event_emitter.cc b/atom/browser/api/event_emitter.cc
new file mode 100644
index 00000000000..5192c63488e
--- /dev/null
+++ b/atom/browser/api/event_emitter.cc
@@ -0,0 +1,53 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/api/event_emitter.h"
+
+#include <vector>
+
+#include "atom/browser/api/event.h"
+#include "atom/common/native_mate_converters/v8_value_converter.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+
+#include "atom/common/node_includes.h"
+
+namespace mate {
+
+EventEmitter::EventEmitter() {
+}
+
+bool EventEmitter::Emit(const base::StringPiece& name) {
+  return Emit(name, base::ListValue());
+}
+
+bool EventEmitter::Emit(const base::StringPiece& name,
+                        const base::ListValue& args) {
+  v8::Locker locker(node_isolate);
+  v8::HandleScope handle_scope(node_isolate);
+
+  v8::Handle<v8::Context> context = v8::Context::GetCurrent();
+  scoped_ptr<atom::V8ValueConverter> converter(new atom::V8ValueConverter);
+
+  mate::Handle<mate::Event> event = mate::Event::Create(node_isolate);
+
+  // v8_args = [name, event, args...];
+  std::vector<v8::Handle<v8::Value>> v8_args;
+  v8_args.reserve(args.GetSize() + 2);
+  v8_args.push_back(mate::StringToV8(node_isolate, name));
+  v8_args.push_back(event.ToV8());
+  for (size_t i = 0; i < args.GetSize(); i++) {
+    const base::Value* value(NULL);
+    if (args.Get(i, &value))
+      v8_args.push_back(converter->ToV8Value(value, context));
+  }
+
+  // this.emit.apply(this, v8_args);
+  node::MakeCallback(
+      GetWrapper(node_isolate), "emit", v8_args.size(), &v8_args[0]);
+
+  return event->prevent_default();
+}
+
+}  // namespace mate
diff --git a/atom/browser/api/event_emitter.h b/atom/browser/api/event_emitter.h
new file mode 100644
index 00000000000..44e586c020d
--- /dev/null
+++ b/atom/browser/api/event_emitter.h
@@ -0,0 +1,33 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_API_EVENT_EMITTER_H_
+#define ATOM_BROWSER_API_EVENT_EMITTER_H_
+
+#include "native_mate/wrappable.h"
+
+namespace base {
+class ListValue;
+}
+
+namespace mate {
+
+// Provide helperers to emit event in JavaScript.
+class EventEmitter : public Wrappable {
+ protected:
+  EventEmitter();
+
+  // this.emit(name);
+  bool Emit(const base::StringPiece& name);
+
+  // this.emit(name, args...);
+  bool Emit(const base::StringPiece& name, const base::ListValue& args);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(EventEmitter);
+};
+
+}  // namespace mate
+
+#endif  // ATOM_BROWSER_API_EVENT_EMITTER_H_