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Character encoding auto-detection in JavaScript (port of python's chardet)


Port of python's chardet (


npm install jschardet
var jschardet = require("jschardet")

// "àíàçã" in UTF-8
// { encoding: "UTF-8", confidence: 0.9690625 }

// "次常用國字標準字體表" in Big5 
// { encoding: "Big5", confidence: 0.99 }
// See all information related to the confidence levels of each encoding. 
// This is useful to see why you're not getting the expected encoding. 
jschardet.Constants._debug = true;
// Default minimum accepted confidence level is 0.20 but sometimes this is not 
// enough, specially when dealing with files mostly with numbers. 
// To change this to 0 to always get something or any other value that can 
// work for you. 
jschardet.Constants.MINIMUM_THRESHOLD = 0;
  • Big5, GB2312/GB18030, EUC-TW, HZ-GB-2312, and ISO-2022-CN (Traditional and Simplified Chinese)
  • EUC-JP, SHIFT_JIS, and ISO-2022-JP (Japanese)
  • EUC-KR and ISO-2022-KR (Korean)
  • KOI8-R, MacCyrillic, IBM855, IBM866, ISO-8859-5, and windows-1251 (Russian)
  • ISO-8859-2 and windows-1250 (Hungarian)
  • ISO-8859-5 and windows-1251 (Bulgarian)
  • windows-1252
  • ISO-8859-7 and windows-1253 (Greek)
  • ISO-8859-8 and windows-1255 (Visual and Logical Hebrew)
  • TIS-620 (Thai)
  • UTF-32 BE, LE, 3412-ordered, or 2143-ordered (with a BOM)
  • UTF-16 BE or LE (with a BOM)
  • UTF-8 (with or without a BOM)

I haven't been able to create tests to correctly detect:

  • ISO-2022-CN
  • windows-1250 in Hungarian
  • windows-1251 in Bulgarian
  • windows-1253 in Greek
  • EUC-CN

A one-file minimized version is missing.

Ported from python to JavaScript by António Afonso ( Transformed into an npm package by Markus Ast (