Can't upload image to cloudinary - node.js

Question

can you please tell me, what i doing wrong, when try to upload image to cloudinary?
app.js
I don't need to store images on server, so i store it in memory.
var cloudinary = require('cloudinary');
cloudinary.config({
cloud_name: 'hidden',
api_key: 'hidden',
api_secret: 'hidden'
});
var multer = require('multer');
var storage = multer.memoryStorage()
var upload = multer({ storage: storage })
Site form (jade/pug)
form(action="/?_csrf="+csrfToken method="post" enctype='multipart/form-data')
input(type="file" name="avatar")
input(type="submit" value="upload")
App post
app.post('/', upload.single('avatar'), function(req, res, next){
console.log('Should be undefined:', req.file.path); //yes
console.log('Should be the buffer:', req.file.buffer); //yes
cloudinary.uploader.upload(req.file.path, function(result) { console.log(result) });
});
and i get error
{ error: { message: 'Missing required parameter - file', http_code: 400 } }

Answer 1

i find out how (just use Datauri):
var dUri = new Datauri();
dUri.format(path.extname('TEST').toString(), req.file.buffer);
cloudinary.uploader.upload(dUri.content, function (err, result) {
if (err) {
console.log(err);
} else {
console.log(result);
}
});

Answer 2

I wasnt able to upload directly from my form to server but i used a trick first i stored files on disk then try to upload my file.
i use heroku hosting it means my files will be delete after 30 min. it means i will not have any storage problem.
//#1 i collect data into storage ./image/filename
await file.mv('./image/' + filename, async (err) => {
if (err) {
console.log("server'/upload' : faild to upload error =>" + err)
res.send('Save files => error : ' + err)
}
else {
try {
const client = await pool.connect()
//await client.query(`INSERT INTO test_table(id, name) VALUES(${1},'${"test"}')`)
const result = await client.query(`INSERT into post(musicname,artistname,price, music, picture)
VALUES ('${textName}','${textArtist}','${textPrice}', '${musicname}','${filename}')`);
res.send("server'/upload' : inserting new Data is Done.")
console.log("server'/upload' : inserting new Data is Done.")
client.release();
} catch (err) {
console.error(err);
res.send("Error " + err);
}
}
})
await fileMusic.mv('./music/' + musicname, (err) => {
if (err) {
console.log(err)
res.send('save files => error')
}
})
//#2 uplaoding collected data into cloudinary
await cloudinary.v2.uploader.upload('./image/' + filename, {public_id: `${filename}`},
function(error, result){
result;
console.log(result.url, error)
});