tcp spy

TCP Proxy server for debugging purposes.
Install
npm install tcp-spy
Or if you're going to use the command line tool
npm install tcp-spy -g
CLI
You can run the command line interface like this.
Usage:
tcp-spy port [forward_host:]forward_port [options]
Options:
--hex -x Hexadecimal output
example
tcp-spy 3000 localhost:25
screenshots
HTTP example

Example with the hex option

module
You can also use tcp-spy as a node module like this.
var tcpSpy = require('tcp-spy');
var spy = tcpSpy({
port: 3000,
forwardHost: 'localhost',
forwardPort: 25
});
spy.on('connection', function(client, server) {
client.pipe(process.stdout);
server.pipe(process.stdout);
});
License
MIT License
Copyright 2014 Eduardo Sorribas
http://sorribas.org
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.