A middleware component for node-http-proxy to transform the response from the proxied server. It can be used to transform JavaScript, pictures or any other data. If you're looking for an easy solution to modify HTML, have a look at harmon which uses trumpet for modifying HTML.

$ npm install transformer-proxy

A basic example can be found in examples/simple.js. The quintessence is that you can tell your connect-app to use an own function for transforming all data.

var transformerFunction = function (data, req) {
  // do something with the data and return it
  return data + "\n // an additional line the end of every file";
}
app.use(transformerProxy(transformerFunction));

The example also includes additional code for setting up a basic server and the corresponding proxy.

Start it as follows:

$ cd node_modules/transformer-proxy/examples
$ node simple.js

When visiting localhost:3000 you should see:

A simple HTML file

When visiting localhost:8013 you should see:

A simple HTML file
// an additional line the end of every file

Just pass an options object as the second parameter to transformerProxy which has a match attribute. For example, if you want to modify only JavaScript files, you could use:

transformerProxy(transformerFunction, {match : /\.js([^\w]|$)/})

MIT © Philipp Otto 2014