cant view image that I downloaded using aws-sdk and wrote to disk using node-CodePudding

Im downloading an image (.png file) on my express server from an s3 bucket using the aws-sdk for node and then writing it to the disk using fs.writeFileSync. the problem is when I try to view the image on my computer, it says: is appears that we dont support this file format. I checked properties of the downloaded images and its 37.2 KB so it means something was returned.

Is this not the correct way to download the image?

here is my code:

function downloadFile(fileKey) {
  const downloadParams = {
    Key: fileKey,
    Bucket: bucketName,
  };
  return s3.getObject(downloadParams).promise();
}


router.get("/getImage", async (req, res) => {
  try {
    let image= await downloadFile(`${req.query.imageID}.png`);
    fs.writeFileSync(`Images/${req.query.image}.png`, image);

    res.status(200).send();
  } catch (e) {
    console.log(e);
    res.status(500).send(e);
  }
});

CodePudding user response：

in your code please make sure you passed the correct parameter to fs.writeFileAsync. as I can see plot instead of the image.

second please make sure to download the image directly from the s3 and make sure you are able to view it on your computer if not you have to add the 'Content-Type': 'image/png' while uploading the image to s3.

CodePudding user response：

My mistake was that I writing the full s3 result to the disk(image) and not the Body from the result. this is the correct code:

 fs.writeFileSync(`Images/${req.query.taskID}-plot.png`, image.Body);