Retrieve an item from an S3 bucket using an Express JS server and deliver it as the response

Question

Retrieve an item from an S3 bucket using an Express JS server and deliver it as the response

When a client makes an authorized request, I need to send a file back as a response. The file is retrieved from the S3 bucket. What steps should I take to retrieve the file from S3 and deliver it to the client?

const s3 = new S3Client({...})

router.get('/getfile', (req, res) => {
  const data = await s3.send(
    new GetObjectCommand({
      Bucket: 'bucket',
      Key: 'path',
    })
  )

  // How can we efficiently send back the file?
  // res.send(fileStream)
})

What is the best method for sending back the data?

javascript express amazon-s3

Answer 1

Answer №1

Implement the pipe() method to send the stream directly to the response.

const { Body, ContentType, ContentDisposition } = await s3.send(command);

res.setHeader('Content-Type', ContentType);
res.setHeader('Content-Disposition', ContentDisposition || `attachment; filename="untitled"`);

Body.pipe(res);

Answer 2

Implement the pipe() method to send the stream directly to the response.

const { Body, ContentType, ContentDisposition } = await s3.send(command);

res.setHeader('Content-Type', ContentType);
res.setHeader('Content-Disposition', ContentDisposition || `attachment; filename="untitled"`);

Body.pipe(res);

Retrieve an item from an S3 bucket using an Express JS server and deliver it as the response

Answer №1

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