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Problem uploading converted image file(.dng) into dropbox

I have an application in node js in which I am uploading the image to the node server after that I compress the file to reduce the size. After that, I upload it to dropbox but the uploaded file has a 0-byte size. I don't understand the problem. Below is the code that I used.

var dir ="C:\\Users\\uploads\\converted\\"+foldername;

        fs.readdir("C:\\Users\\uploads\\converted\\"+foldername, function (err, files) {
            //handling error
            if (err) {
                return console.log('Unable to scan directory: ' + err);
            } 
            else {
                //listing all files using forEach
                files.forEach(function (file) {
                    
                    console.log(file); 
                    var dbx = new Dropbox({ accessToken: 'xxxx' });
                    dbx.filesUpload({path: '/'+link+'/'+file , contents: file.data})
                        .then(function(response) {
                        console.log(response);
                    })
                    .catch(function(error) {
                        console.error(error);
                    });
                });
            }
            
        });

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Comments

Greg-DB

[Cross-linking for reference: https://stackoverflow.com/questions/65039727/problem-uploading-converted-image-file-dng-into-dropbox ]

When uploading a file to Dropbox via the filesUpload method in the official Dropbox API v2 JavaScript SDK, you need to pass in the file data to upload as the "contents" parameter in the FilesCommitInfo.

In your code, I see you're passing in the 'file.data' variable, but this apparently does not contain any data and so your uploaded file is empty. I see you're calling fs.readdir to get the list of files in the folder, but that does not actually give you the file data for each file. It just gives you the file name. You'll need to instead get the file data from the local filesystem and pass it to the filesUpload method, e.g., perhaps using the fs.readFile method.

JagsDew

Thank you for your solution. I tried this code with changes but this time even the image file is not uploaded to dropbox. Please find my updated code below.

var namefile= path.basename("C:\\Users\\uploads\\converted\\"+foldername+"\\"+req.file.originalname,".ARW" );

var image =namefile+".dng";
fs.readFile("C:\\Users\\uploads\\converted\\"+foldername+"\\"+image, function(err, data) {

    var dbx = new Dropbox({ accessToken: 'XXXX' });
    dbx.filesUpload({path: '/'+link+'/'+image, contents: data})
        .then(function(response) {
        console.log(response);
    })
    .catch(function(error) {
        console.error(error);
    });
});

I appreciate your help.

Greg-DB

Have you checked what the value of your 'data' variable is? Does it contain the expected file contents?

I notice you aren't checking the 'err' variable for the readFile call, so you may not be catching any errors that are occurring when reading the file. You should update your code to check that.