zippy.js

function convertToIntArray(hex){
var bytes = [],
    str;

for(var i=0; i<hex.length-1;i+=2){
	bytes.push(parseInt(hex.substr(i, 2), 16))
}

return bytes;

}


var hex =  

"504b03040A0000000000c37c8c4800000000000000000000000008000000746573742e747874504b010214000a0000000000c37c8c48000000000000000000000000080024000000000000002000000000000000746573742e7478740a0020000000000001001800d068f6d4f294d101d068f6d4f294d101d068f6d4f294d101504b050600000000010001005a000000260000000000";
var bytes = convertToIntArray(hex);
options = {};
options.fileName = "asd";

var ab  = new ArrayBuffer(bytes.length);
var ia = new Uint8Array(ab);

for (var i = 0; i < bytes.length; i++) {
  ia[i] = bytes[i];
}
var b = new Blob([ia], {type: "application/octet-stream"});

var url = window.URL.createObjectURL(b),
              a = document.createElement("a");
        
        document.body.appendChild(a);
        a.href = url;
        a.download = options ? options.fileName + "" : "excelReport.xls";
        a.click(); 

Downloads a zip file in your browser