middleware

getmscode2013 · getmscode2013 · commit 63cb61d55bce · 2020-05-13T20:45:27.000+05:30
diff --git a/.gitignore b/.gitignore
@@ -44,6 +44,7 @@ day10-expressTest/node_modules/
 day11-ExpressAppGenerator/node_modules/
 day12-StaticFiles/node_modules/
 day13-BasicRouting/node_modules/
+day14-Middleware/node_modules/
 
 # TypeScript v1 declaration files
 typings/
diff --git a/day13-BasicRouting/index.js b/day13-BasicRouting/index.js
@@ -58,6 +58,11 @@ app.get('/users/:userId', function (req, res) {
     res.send(req.params)
 })
 
+// If you want passing value whould not mandatory than you can use
+app.get('/users/:userId?', function (req, res) {
+    res.send(req.params)
+})
+
 // You can pass the mutiple paramnter on route URL as like below.
 // Input http://localhost:4000/users/50/books/5
 // Output {"userId":"50","bookId":"5"}
diff --git a/day14-Middleware/LocalMiddleware.js b/day14-Middleware/LocalMiddleware.js
@@ -0,0 +1,29 @@
+// How to call the middle ware only for one function not for all
+
+
+// Let see the simple function for req and response
+
+var express = require('express')
+var app = express()
+
+
+// Logging of original URL
+function logOriginalUrl (req, res, next) {
+    console.log('Request URL:', req.originalUrl)
+    next()
+  }
+
+
+  // Log methods
+  function logMethod (req, res, next) {
+    console.log('Request Type:', req.method)
+    next()
+  }
+  
+  var logStuff = [logOriginalUrl, logMethod]
+  app.get('/user/:id', logStuff, function (req, res, next) {
+    res.send('User Info')
+  })
+
+
+app.listen(3000, () => console.log("Application running on 3000 port"))
diff --git a/day14-Middleware/index.js b/day14-Middleware/index.js
@@ -0,0 +1,38 @@
+// Middleware is using between the req recive from client and before responding to it.
+// In Middleware we have three paramenter req, res and the new one is next.
+// You can see more detail from expressJs website
+// https://expressjs.com/en/guide/writing-middleware.html
+//Middleware functions can perform the following tasks:
+
+// > Execute any code.
+// > Make changes to the request and the response objects.
+// > End the request-response cycle.
+// > Call the next middleware in the stack.
+
+
+// Let see the simple function for req and response
+
+var express = require('express')
+var app = express()
+
+
+// Small middle ware for logging, but you need to include it to application.
+// he next() function is not a part of the Node.js or Express API, but is the third argument that is passed to the middleware function.
+
+var myLogger = function (req, res, next) {
+  console.log('LOGGED')
+  next()
+}
+
+// To load the middleware function, call app.use(), specifying the middleware function.
+// Calling the global
+app.use(myLogger)
+
+
+app.get('/', function (req, res) {
+  res.send('Hello World!')
+})
+
+
+
+app.listen(3000, () => console.log("Application running on 3000 port"))
diff --git a/day14-Middleware/package-lock.json b/day14-Middleware/package-lock.json
diff --git a/day14-Middleware/package.json b/day14-Middleware/package.json
