Edit in JSFiddle

//first arguement must be an regular array. The array can be of any javascript objects. Array can contain array to make it multi dimensional 
//second parameter must be a BlogPropertyBag object containing MIME property
var myBlob = new Blob(["This is my blob content"], {type : "text/plain"});
var myReader = new FileReader();
//handler executed once reading(blob content referenced to a variable) from blob is finished. 
myReader.addEventListener("loadend", function(e){
    document.getElementById("paragraph").innerHTML = e.srcElement.result;//prints a string
});
//start the reading process.
myReader.readAsText(myBlob);

<p id="paragraph"></p>