Print Environment Variables for a node Express application.

app.js

var express = require('express'),
    app = express();

app.get('/', function(req, res) {
  res.contentType('application/json');
  res.send(process.env);
});

app.listen(process.env.PORT);

package.json

{
  "name": "PrintEnv",
  "version": "0.0.1",
  "description": "Displays environment variables.",
  "author": "Brandon Cannaday",
  "dependencies": {
    "express" : "3.1.x"
  }
}