M config.js → config.js

@@ -1,6 +1,7 @@
 module.exports = {
 
     'secret': 'secretfortoken',
-    'database': 'mongodb://userdb:userdb@ds013366.mlab.com:13366/thoughts'
+    'database': 'mongodb://userdb:userdb@ds013366.mlab.com:13366/thoughts',
+    "port" : process.env.PORT || 3000
 
 };

M package.json → package.json

@@ -3,6 +3,9 @@ "name": "thougts",
   "version": "0.0.1",
   "description": "micro blogging server and client",
   "main": "server.js",
+  "scripts": {
+    "start": "node server.js"  
+  },
   "dependencies": {
       "mongoose": "^4.5.6",
       "express": "^4.7.1",

M server.js → server.js

@@ -118,6 +118,6 @@ app.use('/api', apiRoutes);
 // end of API routes -------------------------------------
 
 // Start server
-app.listen(3000, function() {
+app.listen(config.port, function() {
   console.log("Node server running on http://localhost:3000");
 });