env-server.js

// A BASIC Node server listening for environment variables

const http = require("http");
const url = require("url");
const debug = require("debug")("app");
//listen for env variable NODE_ENV = development | production
const env = process.env.NODE_ENV ? process.env.NODE_ENV : "development";
const port = env === "development" ? 3000 : 5000;

const server = http.createServer(function(req, res) {
  debug(req.url, req.method);
  debug(req.headers);

  res.setHeader("Content-type", "application/json");
  res.setHeader("Access-Control-Allow-Origin", "*");
  res.writeHead(200, "OK", { "Content-Type": "application/json" });

  let dataObj = { id: 123, name: "Bob", email: "[email protected]" };
  let data = JSON.stringify(dataObj);
  res.end(data);
});

server.listen(port, function() {
  console.log(`Listening for ${env} on port ${port}`);
});