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# Punycode.js [](https://travis-ci.org/bestiejs/punycode.js) [](https://codecov.io/gh/bestiejs/punycode.js) [](https://gemnasium.com/bestiejs/punycode.js) |
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Punycode.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). |
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This JavaScript library is the result of comparing, optimizing and documenting different open-source implementations of the Punycode algorithm: |
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* [The C example code from RFC 3492](https://tools.ietf.org/html/rfc3492#appendix-C) |
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* [`punycode.c` by _Markus W. Scherer_ (IBM)](http://opensource.apple.com/source/ICU/ICU-400.42/icuSources/common/punycode.c) |
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* [`punycode.c` by _Ben Noordhuis_](https://github.com/bnoordhuis/punycode/blob/master/punycode.c) |
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* [JavaScript implementation by _some_](http://stackoverflow.com/questions/183485/can-anyone-recommend-a-good-free-javascript-for-punycode-to-unicode-conversion/301287#301287) |
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* [`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)) |
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This 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). |
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The 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). |
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## Installation |
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Via [npm](https://www.npmjs.com/): |
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```bash |
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npm install punycode --save |
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``` |
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In [Node.js](https://nodejs.org/): |
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```js |
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const punycode = require('punycode'); |
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``` |
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## API |
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### `punycode.decode(string)` |
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Converts a Punycode string of ASCII symbols to a string of Unicode symbols. |
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```js |
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// decode domain name parts |
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punycode.decode('maana-pta'); // 'mañana' |
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punycode.decode('--dqo34k'); // '☃-⌘' |
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``` |
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### `punycode.encode(string)` |
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Converts a string of Unicode symbols to a Punycode string of ASCII symbols. |
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```js |
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// encode domain name parts |
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punycode.encode('mañana'); // 'maana-pta' |
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punycode.encode('☃-⌘'); // '--dqo34k' |
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``` |
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### `punycode.toUnicode(input)` |
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Converts 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. |
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```js |
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// decode domain names |
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punycode.toUnicode('xn--maana-pta.com'); |
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// → 'mañana.com' |
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punycode.toUnicode('xn----dqo34k.com'); |
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// → '☃-⌘.com' |
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// decode email addresses |
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punycode.toUnicode('джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq'); |
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// → 'джумла@джpумлатест.bрфa' |
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``` |
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### `punycode.toASCII(input)` |
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Converts 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. |
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```js |
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// encode domain names |
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punycode.toASCII('mañana.com'); |
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// → 'xn--maana-pta.com' |
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punycode.toASCII('☃-⌘.com'); |
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// → 'xn----dqo34k.com' |
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// encode email addresses |
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punycode.toASCII('джумла@джpумлатест.bрфa'); |
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// → 'джумла@xn--p-8sbkgc5ag7bhce.xn--ba-lmcq' |
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``` |
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### `punycode.ucs2` |
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#### `punycode.ucs2.decode(string)` |
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Creates 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. |
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```js |
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punycode.ucs2.decode('abc'); |
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// → [0x61, 0x62, 0x63] |
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// surrogate pair for U+1D306 TETRAGRAM FOR CENTRE: |
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punycode.ucs2.decode('\uD834\uDF06'); |
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// → [0x1D306] |
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``` |
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#### `punycode.ucs2.encode(codePoints)` |
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Creates a string based on an array of numeric code point values. |
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```js |
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punycode.ucs2.encode([0x61, 0x62, 0x63]); |
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// → 'abc' |
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punycode.ucs2.encode([0x1D306]); |
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// → '\uD834\uDF06' |
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``` |
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### `punycode.version` |
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A string representing the current Punycode.js version number. |
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## Author |
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| [](https://twitter.com/mathias "Follow @mathias on Twitter") | |
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|---| |
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| [Mathias Bynens](https://mathiasbynens.be/) | |
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## License |
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Punycode.js is available under the [MIT](https://mths.be/mit) license.
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