diff --git a/.editorconfig b/.editorconfig
new file mode 100755
index 0000000..8c52ff9
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.eslintrc b/.eslintrc
new file mode 100755
index 0000000..13e5d61
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,10 @@
+env:
+  browser: false
+  node: true
+rules:
+  no-extra-parens: 2
+  eqeqeq: 2
+  block-scoped-var: 2
+  quotes:
+    - 2
+    - single
diff --git a/.gitattributes b/.gitattributes
new file mode 100755
index 0000000..176a458
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/.gitignore b/.gitignore
new file mode 100755
index 0000000..ba2a97b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+coverage
diff --git a/.travis.yml b/.travis.yml
new file mode 100755
index 0000000..cfe68da
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,8 @@
+language: node_js
+node_js:
+  - '0.10'
+  - '0.11'
+after_script:
+  - npm run-script coveralls
+notifications:
+  email: false
diff --git a/LICENSE b/LICENSE
new file mode 100755
index 0000000..81395e4
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Shinnosuke Watanabe
+
+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.
diff --git a/README.md b/README.md
new file mode 100755
index 0000000..5cf7796
--- /dev/null
+++ b/README.md
@@ -0,0 +1,78 @@
+# script-equal 
+
+[![Build Status](https://travis-ci.org/shinnn/script-equal.svg?branch=master)](https://travis-ci.org/shinnn/script-equal)
+[![Build status](https://ci.appveyor.com/api/projects/status/ia3h5bcsy84vgfpc?svg=true)](https://ci.appveyor.com/project/ShinnosukeWatanabe/script-equal)
+[![Coverage Status](https://img.shields.io/coveralls/shinnn/script-equal.svg)](https://coveralls.io/r/shinnn/script-equal)
+[![Dependency Status](https://david-dm.org/shinnn/script-equal.svg)](https://david-dm.org/shinnn/script-equal)
+[![devDependency Status](https://david-dm.org/shinnn/script-equal/dev-status.svg)](https://david-dm.org/shinnn/script-equal#info=devDependencies)
+
+Check if one JavaScript code is equivalent to another code, using [UglifyJS]
+
+```javascript
+var scriptEqual = require('script-equal');
+
+scriptEqual(
+  'window.foo = {a: 0, b: 1};',
+  'window["foo"]={\nb: 1,\rna: 0\n};'
+); //=> true
+
+scriptEqual(
+  'var foo = 12',
+  'var foo = 1 + 1 * 14 - 3;;;;;;;;;;;;;;;;;;;'
+); //=> true
+```
+
+## Installation
+
+[![NPM version](https://badge.fury.io/js/script-equal.svg)](https://www.npmjs.org/package/script-equal)
+
+[Use npm.](https://www.npmjs.org/doc/cli/npm-install.html)
+
+```
+npm install script-equal
+```
+
+## API
+
+```javascript
+var scriptEqual = require('script-equal');
+```
+
+### scriptEqual(*script0*, *script1* [, *options*])
+
+*script0*:`String` (JavaScript code)  
+*script1*:`String` (JavaScript code)  
+*options*: `Object` ([UglifyJS][options] options)  
+Return: `Boolean`
+
+It compresses two JavaScript string with [UglifyJS]. If the results are the same string, it returns `true`. Otherwise it returns `false`.
+
+You can use all [UglifyJS][options] options.
+
+```javascript
+var scriptEqual = require('script-equal');
+
+var foo = 'a = {}; a.b = 0;';
+var bar = 'a = {}; a[\'b\'] = 0;';
+
+scriptEqual(foo, bar); //=> true
+
+scriptEqual(foo, bar, {
+  compress: {properties: false}
+}); //=> false
+```
+
+It throws an error when it fails to parse strings.
+
+```javascript
+scriptEqual('a = 1', '1 = a'); // Error
+```
+
+## License
+
+Copyright (c) 2014 [Shinnosuke Watanabe](https://github.com/shinnn)
+
+Licensed under [the MIT License](./LICENSE).
+
+[UglifyJS]: https://github.com/mishoo/UglifyJS2
+[options]: https://github.com/mishoo/UglifyJS2#api-reference
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100755
index 0000000..5c3c7d1
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,20 @@
+init:
+  - git config --global core.autocrlf input
+
+version: '{build}'
+
+environment:
+  matrix:
+    - nodejs_version: '0.10'
+    - nodejs_version: '0.11'
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - npm install --production
+  - npm install tape
+
+build: off
+
+test_script:
+  - ps: 'node test.js #PowerShell'
+  - cmd: node test.js
diff --git a/index.js b/index.js
new file mode 100755
index 0000000..2b3acf2
--- /dev/null
+++ b/index.js
@@ -0,0 +1,22 @@
+/*!
+ * script-equal | MIT (c) Shinnosuke Watanabe
+ * https://github.com/shinnn/script-equal
+*/
+'use strict';
+
+var UglifyJS = require('uglify-js');
+var xtend = require('xtend');
+
+module.exports = function scriptEqual(first, second, options) {
+  [first, second].forEach(function(arg, i) {
+    if (typeof arg !== 'string') {
+      throw new TypeError(
+        i === 0 ? 'First' : 'Second',
+        ' argument is not a string. Arguments must be: (string, string[, options])'
+      );
+    }
+  });
+
+  options = xtend(options, {fromString: true});
+  return UglifyJS.minify(first, options).code === UglifyJS.minify(second, options).code;
+};
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..dbf241c
--- /dev/null
+++ b/package.json
@@ -0,0 +1,56 @@
+{
+  "name": "script-equal",
+  "version": "0.0.0",
+  "description": "Check if one JavaScript code is equivalent to another code",
+  "repository": "shinnn/script-equal",
+  "author": {
+    "name": "Shinnosuke Watanabe",
+    "url": "https://github.com/shinnn"
+  },
+  "scripts": {
+    "pretest": "eslint *.js & jscs *.js",
+    "test": "node test.js | tap-spec",
+    "coverage": "istanbul cover test.js",
+    "coveralls": "${npm_package_scripts_coverage} && istanbul-coveralls"
+  },
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "https://github.com/shinnn/script-equal/blob/master/LICENSE"
+    }
+  ],
+  "files": [
+    "index.js",
+    "LICENSE"
+  ],
+  "keywords": [
+    "code",
+    "parse",
+    "compare",
+    "comparison",
+    "equal",
+    "equivalent",
+    "script",
+    "js",
+    "javascript",
+    "uglify",
+    "uglifyjs",
+    "uglify-js"
+  ],
+  "dependencies": {
+    "uglify-js": "^2.4.15",
+    "xtend": "^4.0.0"
+  },
+  "devDependencies": {
+    "eslint": "^0.9.2",
+    "istanbul": "^0.3.2",
+    "istanbul-coveralls": "^1.0.1",
+    "jscs": "^1.7.3",
+    "tap-spec": "^2.1.0",
+    "tape": "^3.0.3"
+  },
+  "jscsConfig": {
+    "preset": "google",
+    "maximumLineLength": 98
+  }
+}
diff --git a/test.js b/test.js
new file mode 100755
index 0000000..7511310
--- /dev/null
+++ b/test.js
@@ -0,0 +1,58 @@
+'use strict';
+
+var scriptEqual = require('./');
+var test = require('tape');
+
+test('scriptEqual()', function(t) {
+  t.plan(7);
+
+  t.strictEqual(
+    scriptEqual(
+      'function w() {};\n(function() {\r\nvar d =2;var arr={e:0, f:[\'\', {}]}})();',
+      '(function() {\nvar w=1+  1*"1",a = {f: ["", {}], e: 0};})();       function w() {}'
+    ),
+    true,
+    'should return boolean if the first script is equivalent to the second.'
+  );
+
+  t.strictEqual(
+    scriptEqual(
+      'a={};a[\'b\']=1;',
+      'a={};a.b=1;',
+      {compress: {properties: false}}
+    ),
+    false,
+    'should support `compress` option.'
+  );
+
+  t.strictEqual(
+    scriptEqual(
+      '(function(a) {a=1})(this)',
+      '(function(b) {b=1})(this)',
+      {mangle: false}
+    ),
+    false,
+    'should support `mangle` option.'
+  );
+
+  t.strictEqual(
+    scriptEqual('', ' ', false),
+    true,
+    'should run completely even if the third argument is falsy.'
+  );
+
+  t.throws(
+    scriptEqual.bind(null, [''], '', {}), /TypeError.*First/,
+    'should throw a type error when the first argument is not a string.'
+  );
+
+  t.throws(
+    scriptEqual.bind(null, '', 1), /TypeError.*Second/,
+    'should throw a type error when the second argument is not a string.'
+  );
+
+  t.throws(
+    scriptEqual.bind(null), /TypeError.*First/,
+    'should throw a type error when it takes no arguments.'
+  );
+});