How to copy a file?

Question

How to copy a file in Node.js?

Example

+ /old
|- image.png
+ /new

I want to copy image1.png from 'old' to 'new' directory.

This doesn't work.

newFile = fs.createWriteStream('./new/image2.png');     
oldFile = fs.createReadStream('./old/image1.png');

oldFile.addListener("data", function(chunk) {
  newFile.write(chunk);
})

oldFile.addListener("close",function() {
  newFile.end();
});

Thanks for reply!

Anything here? http://nodejs.org/api.html#fs-readstream-152 http://nodejs.org/api.html#fs-writestream-154 — mplungjan, Feb 12 '11 at 19:58
new isn't a keyword (can't be used as a variable name)? (not sure) — Guillaume86, Feb 12 '11 at 20:11

score 14 · Answer 1 · answered Jul 04 '12 at 19:00

14

The preferred way currently:

oldFile.pipe(newFile);

answered Jul 04 '12 at 19:00

Antony Hatchkins

31,947
10
111
111

and I suppose `oldFile.on('end', function(){ console.log('ready') });` – Antony Hatchkins Jul 04 '12 at 19:15

b_erb · Answer 2 · 2011-02-14T14:39:04.833

7

newFile.once('open', function(fd){
    require('util').pump(oldFile, newFile);
});

edited Feb 14 '11 at 14:39

answered Feb 13 '11 at 20:25

b_erb

20,932
8
55
64

1

Does this work for you? I use Node v0.4.0 and `newFile` has zero KB. – Baggz Feb 14 '11 at 13:17
3

You must wait for the 'open' event of the file to be written. (I added this now). – b_erb Feb 14 '11 at 14:38
a simple `require('util').pump(oldFile, newFile);` worked for me (not waiting for the open event) – Drew LeSueur Feb 22 '12 at 14:02
`pump` status was like [that](https://groups.google.com/forum/?fromgroups#!topic/nodejs/FwdDQvAf4xM): 'You can expect `util.pump` to go away in the future' as early as Apr'11; it is currently marked 'Experimental' in the docs. See also http://stackoverflow.com/questions/9726507/what-is-the-difference-between-util-pumpstreama-streamb-and-streama-pipestre – Antony Hatchkins Jul 04 '12 at 18:56
1

You're very outdated, use `pipe`!! See Antony Hatchkins answer. – Alba Mendez Oct 21 '12 at 10:46
**But what about the `mode`, `permissions`, `owner` and `timestamps`?** They're lost. Lost in time. Like my cat. – Alba Mendez Oct 21 '12 at 10:49

score 6 · Answer 3 · answered Nov 17 '12 at 19:14

If you want to do this job syncronously, just read and then write the file directly:

var copyFileSync = function(srcFile, destFile, encoding) {
  var content = fs.readFileSync(srcFile, encoding);
  fs.writeFileSync(destFile, content, encoding);
}

Of course, error handling and stuff is always a good idea!

score -3 · Answer 4 · answered Sep 05 '12 at 17:25

-3

fs.rename( './old/image1.png', './new/image2.png', function(err){
  if(err) console.log(err);
  console.log("moved");
});

answered Sep 05 '12 at 17:25

Oleg2tor

531
1
8
18

That's for **moving** (renaming) between the same partition. The OP's asking for **copying** a file. – Alba Mendez Oct 21 '12 at 10:47

How to copy a file?

4 Answers4

Linked