Uploading binary file on Node.js
Take out the following line
req.setEncoding('utf8');You're not receiving utf8 data, you're receiving binary data.
You would be better off using a buffer instead of a string
app.use(function(req, res, next) { var data = new Buffer(''); req.on('data', function(chunk) { data = Buffer.concat([data, chunk]); }); req.on('end', function() { req.rawBody = data; next(); });});