httpUploadProgress is not working as expected for Buffer data?

first check if you have updated library to the latest version and Try Modifying your code with this one:

.on('httpUploadProgress',function(progress) {    console.log(Math.round(progress.loaded/progress.total*100)+ '% done');    });

I am not exactly sure what is going on, but i think this one helps with your problem. Although, the variables used in this are from another similar source. Try adopting the method.

ss(socket).emit('strimage', stream, {size: file.size,name: fileName,email: emailid});//initialize var to 0                    var blobStream = ss.createBlobReadStream(file);                    var size = 0;                    var uploadedSize;                    blobStream.on('data', function(chunk) {                      size += chunk.length;//try giving an upload size                        uploadedSize = Math.floor(size / file.size * 100)                      console.log(uploadedSize + '%');                        if (uploadedSize == 100) {                            console.log("inside uploadedSize");                            socket.emit('uploadcomplete', data);                        }                    });                    blobStream.pipe(stream);