connect-browserify

var express = require('express');
var browserify = require('connect-browserify');
 
app = express();
app.use('/js/app.js', browserify({
  entry: 'src/app.js',            // entry for your application
 
  requirements: ['src/views.js'], // additional modules to require, will
                                  // be exposed under id relative to
                                  // entry, e.g. './views' in current
                                  // example
 
  transforms: ['coffeeify'],        // transforms to use
 
  bundle: function(bundle) {      // optional, configure browserify instance
    // configure bundle
    return bundle
  },
 
  pipes: function(stream) {       // optional, apply post-bundle-transforms
    return stream                 // Receives the browserify bundle stream
      .pipe(uglifyStream);        // Must return another stream
  },
 
  onError: function(err) {        // optional, called if errors occur during the
    console.warn(err);            // build process. If not set, errors are only
  },                              // available via the middleware response
 
  contentType: 'text/javascript', // optional, Content-type header to use, by
                                  // default this equals to 'application/javascript'
 
  extensions: ['.js', '.coffee'], // to consider non-js files as
                                  // CommonJS modules
 
  debug: true                     // see browserify docs, other options are
}));
 
app.listen(3000);