Add environment overrides.

app.js

@@ -9,8 +9,27 @@ var express   = require('express')
   , config    = require('./config')
   , app       = express();
 
-global.io = require('socket.io').listen(app.listen( config.port ));
+/**
+ * Source: http://stackoverflow.com/a/7965071
+ */
+function mergeRecursive(obj1, obj2) {
+    for (var p in obj2) {
+        if (obj2.hasOwnProperty(p)) {
+            obj1[p] = (typeof obj2[p] === 'object') ? mergeRecursive(obj1[p], obj2[p]) : obj2[p];
+        }
+    }
+    return obj1;
+}
+
+// set config by environment
+if (process.env.ENVIRONMENT!='default') {
+    app.config = mergeRecursive(config.default, config[process.env.ENVIRONMENT]);
+} else {
+    app.config = config.default;
+}
 
+// setup socket io
+global.io = require('socket.io').listen(app.listen( app.config.server.port ));
 io.configure(function () {
 	io.set('transports', ['websocket', 'xhr-polling']);
 	io.set('log level', config.log_level);
@@ -24,13 +43,13 @@ io.sockets.on('connection', function (socket)
 
 // db connect
 var db = require('mongoose');
-db.connect(config.db.service+'://'+config.db.host+'/'+config.db.database);
+db.connect(app.config.db.service+'://'+app.config.db.host+'/'+app.config.db.database);
 
 app.configure(function() {
 	app.set('views', __dirname + '/views');
 	app.set('view engine', 'ejs');
 	app.set('view options', { layout:true, pretty: true });
-	app.set('config', config);
+	app.set('config', app.config);
 	app.set('db', db);
 	app.use(express.favicon());
 	app.use(express.logger('dev'));

config.json

@@ -1,9 +1,18 @@
 {
-  "log_level": 0,
-  "port": 3000,
-  "db": {
-    "service": "mongodb",
-    "host": "localhost",
-    "database": "search_for_404_v4"
+  "default": {
+    "log_level": 0,
+    "server": {
+      "scheme": "http",
+      "host": "localhost",
+      "port": 3000
+    },
+    "db": {
+      "service": "mongodb",
+      "host": "localhost",
+      "database": "search_for_404_v4"
+    }
+  },
+  "development": {
+    "log_level": 1
   }
 }