javascript - How to get file size of newly created Image() if src is base64 string? -


how can size of newly created new image() in bytes if image's src base64 data image?

i have such coffeescript code:

# string received after original image preprocessing base64string = "data:image/jpeg;base64......"  newimageobj = new image() newimageobj.src = base64string newimageobj.onload = ->   console.log "resized image width " + this.width   console.log "new file size in bytes " + newimageobj.filesize

the output this:

resized image width 500 new file size in bytes undefined

this newimageobj.filesize undefined.

i'd use above, work correctly in case data isn't formatted correctly (eg, '=' missing, gets decoded correctly anyway)

new buffer(base64string, 'base64').length

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