Get file name from base64 string

Question

I have base64 decoded file as follows:

"data:application/vnd.openxmlformats-officedocument.wordprocessingml.document;base64,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…"

That is this file:

Is there any easy way to get the file name from the base64 string using only javascript?

A data URL string does not contain any information on what the original file name was. — Derek 朕會功夫
– Derek 朕會功夫, Commented Nov 28, 2017 at 7:46
https://stackoverflow.com/questions/24245105/how-to-get-the-filename-from-the-javascript-filereader check this one — Nikhil Ghuse
– Nikhil Ghuse, Commented Nov 28, 2017 at 7:48
If you already seem to have the file data(aka the picture in your question), why don't you use that? — Ionut Necula
– Ionut Necula, Commented Nov 28, 2017 at 8:05
@Ionut I need to send this file to the server as base64. And from the server I get that base64 back. Thus, on that moment I do not have the file, only the base64 string. — Boky
– Boky, Commented Nov 28, 2017 at 8:06
Ok, and on the server side what language do you use? Maybe you can decode it there. Or you can take a look at this link stackoverflow.com/questions/2820249/… which may help. — Ionut Necula
– Ionut Necula, Commented Nov 28, 2017 at 8:08

Shadow · Accepted Answer · 2017-11-28 07:47:03Z

36

Well, no... the base64 string doesn't contain the file name, only the contents of the file.

If you want to keep the filename, you're going to have to store it some other way. It's already available on the file object you have shown us, you'll just have to store it in a reasonable manner for whatever your use-case is.

answered Nov 28, 2017 at 7:47

Shadow

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mvofreire · Accepted Answer · 2024-04-24 10:07:36Z

In JS you can execute a regex to get the file name from a base64 string.

const regex = /filename:([^,]+\.csv)/;
const str = "data:text/csv;base64,TmFtZSxBZ2UsQnJlZWQsQ29sb3IKQnVkZHksMyxHb2xkZW4gUmV0cmlldmVyLEdvbGRlbgpNYXgsNSxHZXJtYW4gU2hlcGhlcmQsQmxhY2sgYW5kIFRhbgpCYWlsZXksMixMYWJyYWRvciBSZXRyaWV2ZXIsQ2hvY29sYXRlCkx1Y3ksNCxCZWFnbGUsVHJpLWNvbG9yCkNoYXJsaWUsNixQb29kbGUsV2hpdGUKRGFpc3ksMSxCdWxsZG9nLEJyb3duIGFuZCBXaGl0ZQpDb29wZXIsNyxTaWJlcmlhbiBIdXNreSxHcmF5IGFuZCBXaGl0ZQpNb2xseSw0LERhY2hzaHVuZCxSZWQKUm9ja3ksMixCb3hlcixGYXduCkJlbGxhLDUsWW9ya3NoaXJlIFRlcnJpZXIsQmxhY2sgYW5kIFRhbg==,filename:dogs.csv";
const match = str.match(regex);

if (match) {
    console.log(match[0]); // This will output: filename:dogs.csv
}

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