code

package.json

@@ -0,0 +1,14 @@
+{
+  "name": "writing-express-middleware",
+  "version": "0.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.12.3"
+  }
+}

server.js

@@ -0,0 +1,33 @@
+'use strict';
+
+var express = require('express');
+
+var app = express();
+
+function logger(req,res,next){
+  console.log(new Date(), req.method, req.url);
+  next();
+}
+
+function hello(req,res,next){
+  res.write('Hello \n');
+  next();
+}
+
+function bye(req,res,next){
+  res.write('Bye \n');
+  res.end();
+}
+
+var apiRouter = express.Router();
+
+apiRouter.use(logger);
+
+// app.use(hello,bye);
+
+app.use('/api',apiRouter);
+
+app.use(hello,bye);
+
+var server = app.listen(3000);
+