Javascript <-> UTF-8 conversion tool

JStoUTF8Converter.js

var JStoUTF8Converter = {
    encode: function(input) {
        var output = '';
        for (var i = 0; i < input.length; i++) {
            var j = '\b\t\n\v\f\r"\'\\'.indexOf(input.charAt(i));
            if (j != -1) {
                output += '\\' + 'btnvfr"\'\\'.substr(j, 1);
            } else if (input.substr(i, 2) == '</') {
                output += '<\\/';
                i++;
            } else {
                if (input.charCodeAt(i) > 255) {
                    output += '\\u' + ('000' + input.charCodeAt(i).toString(16)).right(4);
                } else {
                    output += '\\x' + ('0' + input.charCodeAt(i).toString(16)).right(2);
                }
            } else {
                output += input.charAt(i);
            }
        }
        return output;
    },
    decode: function(input) {
        try {
            return !/([^\\]'|\r|\n)/.test(input) ? eval("'" + input + "'") : false;
        } catch (e) {
            return false;
        }
    }
};

module.exports = JStoUTF8Converter;

Converts HTML to a string that can be stored in a JSON document (and back).
Inspired by http://coderstoolbox.net/string/#!encoding=xml&action=encode&charset=us_ascii