some changes

localApp.js

@@ -0,0 +1,21 @@
+var express = require('express');
+var bodyParser = require('body-parser');
+
+var app = express();
+var port = 3000;
+
+// body parser middleware
+app.use(bodyParser.urlencoded({ extended: true }));
+
+// test route
+app.get('/', function (req, res) { res.status(200).send('Hello world!') });
+
+// error handler
+app.use(function (err, req, res, next) {
+  console.error(err.stack);
+  res.status(400).send(err.message);
+});
+
+app.listen(port, function () {
+  console.log('Slack bot listening on port ' + port);
+});