javascript - Change response body before outputting in node.js -

i'm new node.js. i'm tryinbg build small server acting proxy post call opendata service, doing stuff, binding presentation layer, outputting browser.

here's code:

dispatcher.onget("/metro", function(req, res) {   var r = request({body: '<?xml version="1.0" encoding="iso-8859-1" ?><poirequest><poi_id>87087</poi_id><lng>0</lng></poirequest>'}, function (error, response, body) {  if (!error && response.statuscode == 200) {    console.log('public transformation public api called');   } }).pipe(res);  res.on('finish', function() {   console.log('request completed;'); });  });   http.createserver(function (req, res) {   dispatcher.dispatch(req, res); }).listen(1337, '0.0.0.0'); console.log('server listening'); 

the dispatcher simplest found on mpm: https://npmjs.org/package/httpdispatcher question is: how can alter (basically, html-code stripping) response body before outputting output pipe?

you can use concat-stream accumulate of stream data , pass on callback can manipulate before returning browser.

var concat = require('concat-stream');  dispatcher.onget("/metro", function(req, res) {   write = concat(function(completeresponse) {     // here can modify resulting response before passing client.     var finalresponse = modifyresponse(completeresponse);     res.end(finalresponse);   });    request('http://someservice').pipe(write); });   http.createserver(dispatcher.dispatch).listen(1337, '0.0.0.0'); console.log('server listening');