calculate memory size of javascript object, it is not a accurate value!

memorySizeOfObject.js

function memorySizeOf(obj) {
    var bytes = 0;

    function sizeOf(obj) {
        if(obj !== null && obj !== undefined) {
            switch(typeof obj) {
            case 'number':
                bytes += 8;
                break;
            case 'string':
                bytes += obj.length * 2;
                break;
            case 'boolean':
                bytes += 4;
                break;
            case 'object':
                var objClass = Object.prototype.toString.call(obj).slice(8, -1);
                if(objClass === 'Object' || objClass === 'Array') {
                    for(var key in obj) {
                        if(!obj.hasOwnProperty(key)) continue;
                        sizeOf(obj[key]);
                    }
                } else bytes += obj.toString().length * 2;
                break;
            }
        }
        return bytes;
    };

    function formatByteSize(bytes) {
        if(bytes < 1024) return bytes + " bytes";
        else if(bytes < 1048576) return(bytes / 1024).toFixed(3) + " KiB";
        else if(bytes < 1073741824) return(bytes / 1048576).toFixed(3) + " MiB";
        else return(bytes / 1073741824).toFixed(3) + " GiB";
    };

    return formatByteSize(sizeOf(obj));
};

The function sizeOf doesn't work with Uint8Array and other standard types of arrays.

Thankyou, it works

awesome

If someone looking for npm library to calculate size of an object in memory then give a try to this library: https://github.com/miktam/sizeof#readme

   `         bytes += obj.length * 2;`  why  obj.length*2 ,it should be Buffer.byteLength(str)

why bytes += obj.toString().length * 2;

i am getting error :
node:1863) UnhandledPromiseRejectionWarning: RangeError: Maximum call stack size exceeded
at Buffer.toString (buffer.js:776:46)

Im getting same error
Uncaught RangeError: Maximum call stack size exceeded