When are JavaScript Blob objects garbage collected?

Question

In modern browsers, it\'s possible to allocate a large object as a Blob, then request access to it via a URL. This URL will serve the stored object (such as an imag

Answer 1

The browser will eventually clear up this resource, however it may be some while (hours or days) before it is removed from memory/disk.

If you wish to explicitly remove the object, you may do so via revokeObjectURL.

var blob = new Blob([/*JPEG data*/], {type: "image/jpeg"}),
    url = (window.URL || window.webkitURL),
    objectUrl = url.createObjectURL(blob);

// use the object URL, eg:
var img = new Image();

img.onload = function()
{
    // release the object URL once the image has loaded
    url.revokeObjectURL(objectURL);
};

// trigger the image to load
image.src = objectURL;