Error while uploading image on Heroku Node.js app

Question

Route-

app.post('/add-product',(req,res)=>{
var image=randomstring.generate({
    length: 12
});
var form = new formidable.IncomingForm();
form.parse(req, function (err, fields, files) {
    var oldpath = files.pimage.path;
    var newpath = __dirname;
    var path=newpath.split('controllers');
    path=path[0]+'/public/productimages/'+image+".jpg";
    fs.readFile(oldpath, function (err, data) {
        if (err) throw err;
        // Write the file
       fs.writeFile(path, data, function (err) {
           if (err) throw err;
       });
    });
   });
});

Got some problem with uploading images to Heroku server, on Localhost everything work great. But on Heroku when I upload image, my app is getting crashed on these lines.

fs.writeFile(path, data, function (err) {
    if (err) throw err;
});

Heroku log screenshot:

After changing '/public.....' to 'public/productimages/....'

I am getting : no such file or directory, open '/app/public/productimages/8sRueNlG2k3F.jpg'

Answer 1

These errors are typically caused by the target directory (in your case, /app/public/productimages/) not yet existing.

You can use a package like mkdirp to create the directory when your app starts, or you could create the directory locally and create an empty placeholder file (named .placeholder, for instance) that you commit to your Git repository (because Git only deals with files, not directories, you can't add a completely empty directory to a repository).