how to remove X-Powered-By in ExpressJS

Don't remove it; ask Express not to generate it in the first place:

https://stackoverflow.com/a/12484642/506073

Go to your app.js and just after:

var app = express();

Add:

app.disable('x-powered-by');

The better way to do it is:

app.disable('x-powered-by');

You can also make a middleware to remove any header like so:

app.use(function (req, res, next) {
  res.removeHeader("X-Powered-By");
  next();
});

See more info on how to remove a header:

http://nodejs.org/api/http.html#http_response_removeheader_name

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