iconv-lite

iconv-lite: Pure JS character encoding conversion

• No need for native code compilation. Quick to install, works on Windows and in sandboxed environments like Cloud9.
• Used in popular projects like Express.js (body_parser), Grunt, Nodemailer, Yeoman and others.
• Faster than node-iconv (see below for performance comparison).
• Intuitive encode/decode API, including Streaming support.
• In-browser usage via browserify or webpack (~180kb gzip compressed with Buffer shim included).
• Typescript type definition file included.
• React Native is supported (need to install stream module to enable Streaming API).
• License: MIT.

Usage

Basic API

var iconv = require('iconv-lite'); // Convert from an encoded buffer to a js string. str = iconv.decode(Buffer.from([0x68, 0x65, 0x6c, 0x6c, 0x6f]), 'win1251'); // Convert from a js string to an encoded buffer. buf = iconv.encode("Sample input string", 'win1251'); // Check if encoding is supported iconv.encodingExists("us-ascii")

Streaming API

// Decode stream (from binary data stream to js strings) http.createServer(function(req, res) { var converterStream = iconv.decodeStream('win1251'); req.pipe(converterStream); converterStream.on('data', function(str) { console.log(str); // Do something with decoded strings, chunk-by-chunk. }); }); // Convert encoding streaming example fs.createReadStream('file-in-win1251.txt') .pipe(iconv.decodeStream('win1251')) .pipe(iconv.encodeStream('ucs2')) .pipe(fs.createWriteStream('file-in-ucs2.txt')); // Sugar: all encode/decode streams have .collect(cb) method to accumulate data. http.createServer(function(req, res) { req.pipe(iconv.decodeStream('win1251')).collect(function(err, body) { assert(typeof body == 'string'); console.log(body); // full request body string }); });

Supported encodings

• All node.js native encodings: utf8, ucs2 / utf16-le, ascii, binary, base64, hex.
• Additional unicode encodings: utf16, utf16-be, utf-7, utf-7-imap, utf32, utf32-le, and utf32-be.
• All widespread singlebyte encodings: Windows 125x family, ISO-8859 family, IBM/DOS codepages, Macintosh family, KOI8 family, all others supported by iconv library. Aliases like 'latin1', 'us-ascii' also supported.
• All widespread multibyte encodings: CP932, CP936, CP949, CP950, GB2312, GBK, GB18030, Big5, Shift_JIS, EUC-JP.

See all supported encodings on wiki.

Most singlebyte encodings are generated automatically from node-iconv. Thank you Ben Noordhuis and libiconv authors!

Multibyte encodings are generated from Unicode.org mappings and WHATWG Encoding Standard mappings. Thank you, respective authors!

Encoding/decoding speed

Comparison with node-iconv module (1000x256kb, on MacBook Pro, Core i5/2.6 GHz, Node v0.12.0). Note: your results may vary, so please always check on your hardware.

operation iconv@2.1.4 iconv-lite@0.4.7 ---------------------------------------------------------- encode('win1251') ~96 Mb/s ~320 Mb/s decode('win1251') ~95 Mb/s ~246 Mb/s

BOM handling

• Decoding: BOM is stripped by default, unless overridden by passing stripBOM: false in options (f.ex. iconv.decode(buf, enc, {stripBOM: false})). A callback might also be given as a stripBOM parameter - it'll be called if BOM character was actually found.
• If you want to detect UTF-8 BOM when decoding other encodings, use node-autodetect-decoder-stream module.
• Encoding: No BOM added, unless overridden by addBOM: true option.

UTF-16 Encodings

This library supports UTF-16LE, UTF-16BE and UTF-16 encodings. First two are straightforward, but UTF-16 is trying to be smart about endianness in the following ways:

• Decoding: uses BOM and 'spaces heuristic' to determine input endianness. Default is UTF-16LE, but can be overridden with defaultEncoding: 'utf-16be' option. Strips BOM unless stripBOM: false.
• Encoding: uses UTF-16LE and writes BOM by default. Use addBOM: false to override.

UTF-32 Encodings

This library supports UTF-32LE, UTF-32BE and UTF-32 encodings. Like the UTF-16 encoding above, UTF-32 defaults to UTF-32LE, but uses BOM and 'spaces heuristics' to determine input endianness.

• The default of UTF-32LE can be overridden with the defaultEncoding: 'utf-32be' option. Strips BOM unless stripBOM: false.
• Encoding: uses UTF-32LE and writes BOM by default. Use addBOM: false to override. (defaultEncoding: 'utf-32be' can also be used here to change encoding.)

Other notes

When decoding, be sure to supply a Buffer to decode() method, otherwise bad things usually happen.
Untranslatable characters are set to � or ?. No transliteration is currently supported.
Node versions 0.10.31 and 0.11.13 are buggy, don't use them (see #65, #77).

Testing

$ git clone git@github.com:ashtuchkin/iconv-lite.git $ cd iconv-lite $ npm install $ npm test $ # To view performance: $ node test/performance.js $ # To view test coverage: $ npm run coverage $ open coverage/lcov-report/index.html