Decode utf7

utf7.js

// npm install iconv iconv-lite

var Iconv = require("iconv").Iconv,
    iconv = require("iconv-lite");

var str = "abc&AOQA9gD8-";

function convertFromUTF7_old(str){
    var fromUTF7 = new Iconv("UTF-16", "UTF-8//TRANSLIT//IGNORE")
    // default string encoding by inbox is binary
    str = new Buffer(str, "binary").toString("utf-8");
    try{
        return str.replace(/&([^\-]+)\-/g, function(a, r){
            r = (r || "").replace(/,/g, "/");
            return fromUTF7.convert(new Buffer(r, "base64")).toString("utf-8");
        });
    }catch(E){
        return str;
    }
};

function convertFromUTF7_new(str){
    // default string encoding by inbox is binary
    str = new Buffer(str, "binary").toString("utf-8");
    try{
        return str.replace(/&([^\-]+)\-/g, function(a, r){
            r = (r || "").replace(/,/g, "/");
            return iconv.decode(new Buffer(r, 'base64'), 'utf8');
        });
    }catch(E){
        return str;
    }
};

console.log(convertFromUTF7_old(str)); // abcäöü
console.log(convertFromUTF7_new(str)); // abc���