Port of python's chardet (https://github.com/chardet/chardet).

LGPL

npm install jschardet

var jschardet = require("jschardet")

// "àíàçã" in UTF-8
jschardet.detect("\xc3\xa0\xc3\xad\xc3\xa0\xc3\xa7\xc3\xa3")
// { encoding: "UTF-8", confidence: 0.9690625 }

// "次常用國字標準字體表" in Big5
jschardet.detect("\xa6\xb8\xb1\x60\xa5\xce\xb0\xea\xa6\x72\xbc\xd0\xb7\xc7\xa6\x72\xc5\xe9\xaa\xed")
// { encoding: "Big5", confidence: 0.99 }

// Martin Kühl
// jschardet.detectAll("\x3c\x73\x74\x72\x69\x6e\x67\x3e\x4d\x61\x72\x74\x69\x6e\x20\x4b\xfc\x68\x6c\x3c\x2f\x73\x74\x72\x69\x6e\x67\x3e")
// [
//   {encoding: "windows-1252", confidence: 0.95},
//   {encoding: "ISO-8859-2", confidence: 0.8796300205763055},
//   {encoding: "SHIFT_JIS", confidence: 0.01}
// ]

Copy and include jschardet.min.js in your web page.

This library is also available in cdnjs at https://cdnjs.cloudflare.com/ajax/libs/jschardet/1.4.1/jschardet.min.js

// 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.enableDebug();

// 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.detect(str, { minimumThreshold: 0 });

// Lock down which encodings to detect, can be useful in situations jschardet
// is giving a higher probability to encodings that you never use.
jschardet.detect(str, { detectEncodings: ["UTF-8", "windows-1252"] });

• 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)
• ASCII

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

Use npm run dist to update the distribution files. They're available at https://github.com/aadsm/jschardet/tree/master/dist.

Ported from python to JavaScript by António Afonso (https://github.com/aadsm/jschardet)

Transformed into an npm package by Markus Ast (https://github.com/brainafk)