charset-parser/index.js

Parse charset string from http header and hmtl meta

function getCharset(str){

  if(str == null) return null;
  var charset = str.match(/charset=["]*([^>"\s]+)/i);
  if(charset instanceof Array && charset.length >= 2) return charset[1];

  return null;
}

module.exports = function (header, binary, default_charset) {

  var charset = getCharset(header);
  if(binary != null){
    if(charset == null) charset = getCharset(binary);
    if(charset == null) charset=(typeof default_charset==="undefined")?"utf-8":default_charset;
  }

  return charset;
};