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+# psl (Public Suffix List)
+
+[![NPM](https://nodei.co/npm/psl.png?downloads=true&downloadRank=true)](https://nodei.co/npm/psl/)
+
+[![Greenkeeper badge](https://badges.greenkeeper.io/wrangr/psl.svg)](https://greenkeeper.io/)
+[![Build Status](https://travis-ci.org/wrangr/psl.svg?branch=master)](https://travis-ci.org/wrangr/psl)
+[![devDependency Status](https://david-dm.org/wrangr/psl/dev-status.png)](https://david-dm.org/wrangr/psl#info=devDependencies)
+
+`psl` is a `JavaScript` domain name parser based on the
+[Public Suffix List](https://publicsuffix.org/).
+
+This implementation is tested against the
+[test data hosted by Mozilla](http://mxr.mozilla.org/mozilla-central/source/netwerk/test/unit/data/test_psl.txt?raw=1)
+and kindly provided by [Comodo](https://www.comodo.com/).
+
+
+## What is the Public Suffix List?
+
+The Public Suffix List is a cross-vendor initiative to provide an accurate list
+of domain name suffixes.
+
+The Public Suffix List is an initiative of the Mozilla Project, but is
+maintained as a community resource. It is available for use in any software,
+but was originally created to meet the needs of browser manufacturers.
+
+A "public suffix" is one under which Internet users can directly register names.
+Some examples of public suffixes are ".com", ".co.uk" and "pvt.k12.wy.us". The
+Public Suffix List is a list of all known public suffixes.
+
+Source: http://publicsuffix.org
+
+
+## Installation
+
+### Node.js
+
+```sh
+npm install --save psl
+```
+
+### Browser
+
+Download [psl.min.js](https://raw.githubusercontent.com/wrangr/psl/master/dist/psl.min.js)
+and include it in a script tag.
+
+```html
+<script src="psl.min.js"></script>
+```
+
+This script is browserified and wrapped in a [umd](https://github.com/umdjs/umd)
+wrapper so you should be able to use it standalone or together with a module
+loader.
+
+## API
+
+### `psl.parse(domain)`
+
+Parse domain based on Public Suffix List. Returns an `Object` with the following
+properties:
+
+* `tld`: Top level domain (this is the _public suffix_).
+* `sld`: Second level domain (the first private part of the domain name).
+* `domain`: The domain name is the `sld` + `tld`.
+* `subdomain`: Optional parts left of the domain.
+
+#### Example:
+
+```js
+var psl = require('psl');
+
+// Parse domain without subdomain
+var parsed = psl.parse('google.com');
+console.log(parsed.tld); // 'com'
+console.log(parsed.sld); // 'google'
+console.log(parsed.domain); // 'google.com'
+console.log(parsed.subdomain); // null
+
+// Parse domain with subdomain
+var parsed = psl.parse('www.google.com');
+console.log(parsed.tld); // 'com'
+console.log(parsed.sld); // 'google'
+console.log(parsed.domain); // 'google.com'
+console.log(parsed.subdomain); // 'www'
+
+// Parse domain with nested subdomains
+var parsed = psl.parse('a.b.c.d.foo.com');
+console.log(parsed.tld); // 'com'
+console.log(parsed.sld); // 'foo'
+console.log(parsed.domain); // 'foo.com'
+console.log(parsed.subdomain); // 'a.b.c.d'
+```
+
+### `psl.get(domain)`
+
+Get domain name, `sld` + `tld`. Returns `null` if not valid.
+
+#### Example:
+
+```js
+var psl = require('psl');
+
+// null input.
+psl.get(null); // null
+
+// Mixed case.
+psl.get('COM'); // null
+psl.get('example.COM'); // 'example.com'
+psl.get('WwW.example.COM'); // 'example.com'
+
+// Unlisted TLD.
+psl.get('example'); // null
+psl.get('example.example'); // 'example.example'
+psl.get('b.example.example'); // 'example.example'
+psl.get('a.b.example.example'); // 'example.example'
+
+// TLD with only 1 rule.
+psl.get('biz'); // null
+psl.get('domain.biz'); // 'domain.biz'
+psl.get('b.domain.biz'); // 'domain.biz'
+psl.get('a.b.domain.biz'); // 'domain.biz'
+
+// TLD with some 2-level rules.
+psl.get('uk.com'); // null);
+psl.get('example.uk.com'); // 'example.uk.com');
+psl.get('b.example.uk.com'); // 'example.uk.com');
+
+// More complex TLD.
+psl.get('c.kobe.jp'); // null
+psl.get('b.c.kobe.jp'); // 'b.c.kobe.jp'
+psl.get('a.b.c.kobe.jp'); // 'b.c.kobe.jp'
+psl.get('city.kobe.jp'); // 'city.kobe.jp'
+psl.get('www.city.kobe.jp'); // 'city.kobe.jp'
+
+// IDN labels.
+psl.get('食狮.com.cn'); // '食狮.com.cn'
+psl.get('食狮.公司.cn'); // '食狮.公司.cn'
+psl.get('www.食狮.公司.cn'); // '食狮.公司.cn'
+
+// Same as above, but punycoded.
+psl.get('xn--85x722f.com.cn'); // 'xn--85x722f.com.cn'
+psl.get('xn--85x722f.xn--55qx5d.cn'); // 'xn--85x722f.xn--55qx5d.cn'
+psl.get('www.xn--85x722f.xn--55qx5d.cn'); // 'xn--85x722f.xn--55qx5d.cn'
+```
+
+### `psl.isValid(domain)`
+
+Check whether a domain has a valid Public Suffix. Returns a `Boolean` indicating
+whether the domain has a valid Public Suffix.
+
+#### Example
+
+```js
+var psl = require('psl');
+
+psl.isValid('google.com'); // true
+psl.isValid('www.google.com'); // true
+psl.isValid('x.yz'); // false
+```
+
+
+## Testing and Building
+
+Test are written using [`mocha`](https://mochajs.org/) and can be
+run in two different environments: `node` and `phantomjs`.
+
+```sh
+# This will run `eslint`, `mocha` and `karma`.
+npm test
+
+# Individual test environments
+# Run tests in node only.
+./node_modules/.bin/mocha test
+# Run tests in phantomjs only.
+./node_modules/.bin/karma start ./karma.conf.js --single-run
+
+# Build data (parse raw list) and create dist files
+npm run build
+```
+
+Feel free to fork if you see possible improvements!
+
+
+## Acknowledgements
+
+* Mozilla Foundation's [Public Suffix List](https://publicsuffix.org/)
+* Thanks to Rob Stradling of [Comodo](https://www.comodo.com/) for providing
+  test data.
+* Inspired by [weppos/publicsuffix-ruby](https://github.com/weppos/publicsuffix-ruby)
+
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2017 Lupo Montero <lupomontero@gmail.com>
+
+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.