diff --git a/lib/browser.js b/lib/browser.js
new file mode 100644
index 0000000..4acda09
--- /dev/null
+++ b/lib/browser.js
@@ -0,0 +1,32 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Yamagishi Kazutoshi
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+'use strict';
+
+/* global window */
+module.exports = {
+  XMLHttpRequest: window.XMLHttpRequest,
+  XMLHttpRequestUpload: window.XMLHttpRequestUpload,
+  FormData: window.FormData
+};
diff --git a/package.json b/package.json
index 1ff1a3f..e9151f4 100644
--- a/package.json
+++ b/package.json
@@ -9,11 +9,14 @@
     "type": "git",
     "url": "git://github.com/ykzts/node-xmlhttprequest.git"
   },
-  "main": "./lib",
+  "main": "./lib/index.js",
   "scripts": {
     "lint": "npm install && eslint lib/**/*.js test/**/*.js",
     "test": "npm install && mocha test/**/*.js"
   },
+  "browser": {
+    "./lib/index.js": "./lib/browser.js"
+  },
   "dependencies": {},
   "devDependencies": {
     "eslint": "^1.10.3",