chardet Build Status

Chardet is a character detection module for NodeJS written in pure Javascript. Module is based on ICU project, which uses character occurency analysis to determine the most probable encoding.


npm i chardet


To return the encoding with the highest confidence:

var chardet = require('chardet');
chardet.detect(Buffer.alloc('hello there!'));
// or
chardet.detectFile('/path/to/file', function(err, encoding) {});
// or

To return the full list of possible encodings:

var chardet = require('chardet');
chardet.detectAll(Buffer.alloc('hello there!'));
// or
chardet.detectFileAll('/path/to/file', function(err, encoding) {});
// or

//Returned value is an array of objects sorted by confidence value in decending order
//e.g. [{ confidence: 90, name: 'UTF-8'}, {confidence: 20, name: 'windows-1252', lang: 'fr'}]

Working with large data sets

Sometimes, when data set is huge and you want to optimize performace (in tradeoff of less accuracy), you can sample only first N bytes of the buffer:

chardet.detectFile('/path/to/file', { sampleSize: 32 }, function(err, encoding) {});

Supported Encodings:

  • UTF-8
  • UTF-16 LE
  • UTF-16 BE
  • UTF-32 LE
  • UTF-32 BE
  • ISO-2022-JP
  • ISO-2022-KR
  • ISO-2022-CN
  • Shift-JIS
  • Big5
  • EUC-JP
  • EUC-KR
  • GB18030
  • ISO-8859-1
  • ISO-8859-2
  • ISO-8859-5
  • ISO-8859-6
  • ISO-8859-7
  • ISO-8859-8
  • ISO-8859-9
  • windows-1250
  • windows-1251
  • windows-1252
  • windows-1253
  • windows-1254
  • windows-1255
  • windows-1256
  • KOI8-R

Currently only these encodings are supported, more will be added soon.