winston logger file permission exception - node.js

Question

I have written an API using node.js ,in that used "Winston logger". In that the file i have mentioned to write all my logs has owner as "ROOT", so my application exited. When i change the file owner to "my user" my application works. So my conclusion is that the file permission is the problem.
My winston code:
new(winston.transports.File)({
filename: config.path,-------------------->/home/username/logsdir/logfile
//maxsize: 1024 * 1024 * 10, // 10MB
exitOnError: false,
maxsize: 1024 * 1024,
level: 'info',
handleExceptions: true,
levels: customLevels.levels,
rotationFormat: function() {
return getFormattedDate();
function getFormattedDate() {
var temp = new Date();
return dateStr = padStr(temp.getFullYear()) + padStr(1 + temp.getMonth()) + padStr(temp.getDate()) + padStr(temp.getHours()) + padStr(temp.getMinutes()) + padStr(temp.getSeconds());
}
function padStr(i) {
return (i < 10) ? "0" + i : "" + i;
}
}
})]
Winston is not throwing any exception, simply my application exited. IS it possible to check the owner of a file, Or winston has any option to tackle this. I googled a lot but i cant find the solution. Help me to solve this. Thanks in advance.

Answer 1

Winston appears not to provide any help for such cases. The solution is to check for yourself if the file is writable. Here's one way to do so:
var logFile;
[
'/var/log/my-app.log',
path.join(process.cwd(), 'my-app.log'),
path.join('/tmp', 'my-app.log'),
]
.forEach(function (path) {
if (logFile) { return; }
if (fs.accessSync && fs.accessSync(path, fs.W_OK)) {
console.log('logging to ' + path);
logFile = path;
return;
}
var fh;
try { fh = fs.openSync(path, 'a'); }
catch (e) {
console.error(e.message);
return;
}
console.log('logging to ' + path);
logFile = path;
fs.closeSync(fh);
});
Now the variable logFile will have the name of a writable file, if one is writable.