map.export.js

function strMapToObj(strMap) {
    var obj = Object.create(null);
    strMap.forEach(function(val, key) {
        console.log('strMapToObj: ' + key + ' -> ' + val);
        obj[key] = val;
    });
    return obj;
}
function objToStrMap(obj) {
    var strMap = new Map();
    Object.keys(obj).forEach(function (key) {
        strMap.set(key, obj[key]);
    });
    return strMap;
}
function strMapToJson(strMap) {
    return JSON.stringify(strMapToObj(strMap));
}
function jsonToStrMap(jsonStr) {
    return objToStrMap(JSON.parse(jsonStr));
}