jconv

Pure JavaScript Iconv for Japanese encodings.

• This module supports the encodings commonly used in the Japanese Language:
  Shift_JIS(CP932), ISO-2022-JP(-1), EUC-JP, UTF8, UNICODE(UCS2) conversion.
• Pure Javascript, no need to compile.
• Much faster than node-iconv.

[Japanese 日本語]

Installation

$ npm install jconv

Usage

For example simply convert from EUC-JP to Shift_JIS:

var jconv = require( 'jconv' );

var SJISBuffer = jconv.convert( EUCJPBuffer, 'EUCJP', 'SJIS' );

Also available iconv-lite syntax:

var str = jconv.decode( buffer, fromEncoding );

var buf = jconv.encode( 'string', toEncoding );

API

• jconv( input, fromEncoding, toEncoding )

• jconv.convert( input, fromEncoding, toEncoding )

  • input {Buffer} or {String}
  • fromEncoding, toEncoding {String}:
    Shift_JIS(SJIS), ISO-2022-JP(JIS), EUCJP, UTF8, UNICODE(UCS2, UTF16LE) are available.
  • return {Buffer}

• jconv.decode( inputBuffer, fromEncoding )

  • return {String}

• jconv.encode( inputString, toEncoding )

  • return {Buffer}

• jconv.encodingExists( encodingName )

  • return {Boolean}

Performance

Comparison with node-iconv@2.0.7 by converting Japanese text using Benchmark.js.
Environment is Windows7, core i5 2405-S, mem8G, Node 0.10.22. (Please check on your hardware.)
Gray: iconv, Blue: jconv (higher is better)

[latest log]

Encodings

• Supported: Shift_JIS(CP932), ISO-2022-JP(-1), EUC-JP, UTF8, UNICODE(UCS2).

• Supported Windows Dependent Characters <-> JIS Conversion.
  (problem details)

• "JIS X 0208", "JIS X 0212" and "CP932" have the Unicode Mapping Table Differences, so the specific characters ( ～￠￡∥ etc... ) cannot be round-trip converted by default.
  This module corrects this difference as much as possible when converting.
  (problem details)

Development

• Clone Repository

git clone https://github.com/narirou/jconv.git  
cd jconv  
npm install

• Generate Tables

# generates the unicode mapping table module in "tables" folder.
node generators/generate-source  
node generators/generate

• Test

grunt test

• Speed Test

# First, minify the script by closure-compiler.
grunt minify

node test/speed  
# This results are visualized by chart.js.  
# Plese open "chart/index.html".

Based on

• iconv-lite by ashtuchkin.
• Encoding.js by polygonplanet.
• iconv-js by Hikaru02.
• node-iconv by bnoordhuis.
• libiconv-1.9.1-ja-patch Description by 森山 将之.

Thank you so much!

Note

Pull requests are welcome.

Todo

• Streaming API support
• Support more encodings and languages.
• Cleanup the code and more speed.