How do you download a file from AWS S3 to a client's device?

Question

Have looked at all the tutorials on how to download files from S3 to local disk. I have followed all the solutions and what they do is download the file to the server and not to the client. The code I currently have is

app.get('/download_file', function(req, res) {
  var file = fs.createWriteStream('/Users/arthurlecalvez/Downloads/file.csv');
  file.on('close', function(){console.log('done'); });
  s3.getObject({ Bucket: 'data.pool.al14835', Key: req.query.filename }).on('error', function (err) {
   console.log(err);
   }).on('httpData', function (chunk) {
      file.write(chunk);
   }).on('httpDone', function () {
       file.end();
   }).send();

  res.send('success')

 })

How do I then send this to the client so that it is downloaded onto their device?

score 11 · Answer 1 · answered Aug 16 '20 at 02:44

11

you can use SignedURL Like that

var params = {Bucket: bucketname , Key: keyfile , Expires: 3600 , ResponseContentDisposition :  `attachment; filename="filename.ext"` };
var url = s3.getSignedUrl('getObject', params);

the generated link will force download with the name filename.ext

answered Aug 16 '20 at 02:44

Alsemany

445
1
5
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2

This worked better for me than any of the more complex answers. – Darren Gates Jan 16 '21 at 15:44
It is the best answer, you should answer it in all other places – baruchiro May 23 '21 at 10:15

score 10 · Accepted Answer · answered Jan 26 '18 at 06:56

10

S3 supports the ability to generate a pre-signed URL via the AWS Javascript API. Users can then GET this URL to download the S3 object to their local device.

See this question for a Node.js code sample.

answered Jan 26 '18 at 06:56

Adil B

14,635
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score 0 · Answer 3 · answered Aug 05 '21 at 18:59

If you have the file URL you can do it like that,

new Observable((observer) => {
      var xhr = new XMLHttpRequest();
      xhr.open("get", fileURL, true);
      xhr.responseType = "blob";
      xhr.onload = function () {
        if (xhr.readyState === 4) {
          observer.next(xhr.response);
          observer.complete();
        }
      };
      xhr.send();
    }).subscribe((blob: any) => {
      let link = document.createElement("a");
      link.href = window.URL.createObjectURL(blob);
      link.download = elem.material.driverUrl;
      link.click();
    });

The file URL is: https://BucketName.Region.amazonaws.com/Key Just replace with your Bucket name, Region and Key

score 0 · Answer 4 · answered Aug 06 '21 at 15:47

0

You can use the res.download method http://expressjs.com/en/api.html#res.download ?

answered Aug 06 '21 at 15:47

D. Richard

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3
12

How do you download a file from AWS S3 to a client's device?

4 Answers4