Node.js get file extension

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Im creating a file upload function in node.js with express 3.

I would like to grab the file extension of the image. so i can rename the file and then append the file extension to it.

app.post('/upload', function(req, res, next) {
    var is = fs.createReadStream(req.files.upload.path),
        fileExt="", // I want to get the extension of the image here
        os = fs.createWriteStream('public/images/users/' + req.session.adress + '.' + fileExt);
});

How can i get the extension of the image in node.js?

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