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1# Punycode.js [![Build status](https://travis-ci.org/bestiejs/punycode.js.svg?branch=master)](https://travis-ci.org/bestiejs/punycode.js) [![Code coverage status](http://img.shields.io/codecov/c/github/bestiejs/punycode.js.svg)](https://codecov.io/gh/bestiejs/punycode.js) [![Dependency status](https://gemnasium.com/bestiejs/punycode.js.svg)](https://gemnasium.com/bestiejs/punycode.js)
2
3Punycode.js is a robust Punycode converter that fully complies to [RFC 3492](https://tools.ietf.org/html/rfc3492) and [RFC 5891](https://tools.ietf.org/html/rfc5891).
4
5This JavaScript library is the result of comparing, optimizing and documenting different open-source implementations of the Punycode algorithm:
6
7* [The C example code from RFC 3492](https://tools.ietf.org/html/rfc3492#appendix-C)
8* [`punycode.c` by _Markus W. Scherer_ (IBM)](http://opensource.apple.com/source/ICU/ICU-400.42/icuSources/common/punycode.c)
9* [`punycode.c` by _Ben Noordhuis_](https://github.com/bnoordhuis/punycode/blob/master/punycode.c)
10* [JavaScript implementation by _some_](http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion/301287#301287)
11* [`punycode.js` by _Ben Noordhuis_](https://github.com/joyent/node/blob/426298c8c1c0d5b5224ac3658c41e7c2a3fe9377/lib/punycode.js) (note: [not fully compliant](https://github.com/joyent/node/issues/2072))
12
13This project was [bundled](https://github.com/joyent/node/blob/master/lib/punycode.js) with Node.js from [v0.6.2+](https://github.com/joyent/node/compare/975f1930b1...61e796decc) until [v7](https://github.com/nodejs/node/pull/7941) (soft-deprecated).
14
15The current version supports recent versions of Node.js only. It provides a CommonJS module and an ES6 module. For the old version that offers the same functionality with broader support, including Rhino, Ringo, Narwhal, and web browsers, see [v1.4.1](https://github.com/bestiejs/punycode.js/releases/tag/v1.4.1).
16
17## Installation
18
19Via [npm](https://www.npmjs.com/):
20
21```bash
22npm install punycode --save
23```
24
25In [Node.js](https://nodejs.org/):
26
27```js
28const punycode = require('punycode');
29```
30
31## API
32
33### `punycode.decode(string)`
34
35Converts a Punycode string of ASCII symbols to a string of Unicode symbols.
36
37```js
38// decode domain name parts
39punycode.decode('maana-pta'); // 'mañana'
40punycode.decode('--dqo34k'); // '☃-⌘'
41```
42
43### `punycode.encode(string)`
44
45Converts a string of Unicode symbols to a Punycode string of ASCII symbols.
46
47```js
48// encode domain name parts
49punycode.encode('mañana'); // 'maana-pta'
50punycode.encode('☃-⌘'); // '--dqo34k'
51```
52
53### `punycode.toUnicode(input)`
54
55Converts a Punycode string representing a domain name or an email address to Unicode. Only the Punycoded parts of the input will be converted, i.e. it doesn’t matter if you call it on a string that has already been converted to Unicode.
56
57```js
58// decode domain names
59punycode.toUnicode('xn--maana-pta.com');
60// → 'mañana.com'
61punycode.toUnicode('xn----dqo34k.com');
62// → '☃-⌘.com'
63
64// decode email addresses
65punycode.toUnicode('джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq');
66// → 'джумла@джpумлатест.bрфa'
67```
68
69### `punycode.toASCII(input)`
70
71Converts a lowercased Unicode string representing a domain name or an email address to Punycode. Only the non-ASCII parts of the input will be converted, i.e. it doesn’t matter if you call it with a domain that’s already in ASCII.
72
73```js
74// encode domain names
75punycode.toASCII('mañana.com');
76// → 'xn--maana-pta.com'
77punycode.toASCII('☃-⌘.com');
78// → 'xn----dqo34k.com'
79
80// encode email addresses
81punycode.toASCII('джумла@джpумлатест.bрфa');
82// → 'джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq'
83```
84
85### `punycode.ucs2`
86
87#### `punycode.ucs2.decode(string)`
88
89Creates an array containing the numeric code point values of each Unicode symbol in the string. While [JavaScript uses UCS-2 internally](https://mathiasbynens.be/notes/javascript-encoding), this function will convert a pair of surrogate halves (each of which UCS-2 exposes as separate characters) into a single code point, matching UTF-16.
90
91```js
92punycode.ucs2.decode('abc');
93// → [0x61, 0x62, 0x63]
94// surrogate pair for U+1D306 TETRAGRAM FOR CENTRE:
95punycode.ucs2.decode('\uD834\uDF06');
96// → [0x1D306]
97```
98
99#### `punycode.ucs2.encode(codePoints)`
100
101Creates a string based on an array of numeric code point values.
102
103```js
104punycode.ucs2.encode([0x61, 0x62, 0x63]);
105// → 'abc'
106punycode.ucs2.encode([0x1D306]);
107// → '\uD834\uDF06'
108```
109
110### `punycode.version`
111
112A string representing the current Punycode.js version number.
113
114## Author
115
116| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
117|---|
118| [Mathias Bynens](https://mathiasbynens.be/) |
119
120## License
121
122Punycode.js is available under the [MIT](https://mths.be/mit) license.
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