Merge pull request #212 from ZohebMOPO/temp

README.md

@@ -54,6 +54,7 @@ Feel free to take a look. You might learn new things. They have been designed to
 #### Javascript
 
 - [Adonis.js](backend/adonis.js)
+- [Express.js](backend/express.js)
 - [Feathers.js](backend/feathers.js)
 - [Moleculer](backend/moleculer.js)
 - [Node.js](backend/node.js)

backend/express.js

@@ -0,0 +1,226 @@
+/* *******************************************************************************************
+ * API
+ * http://expressjs.com/en/api.html
+ * ******************************************************************************************* */
+`npm i express --save` or`yarn add -D express``(-D saves it as a dev dependency)`
+`yarn add -D @types/express``(Installing for TS)`
+
+const express = require("express"); // Importing the express library.
+const app = express(); // Intializing the imported express application
+
+/* *******************************************************************************************
+ * GLOBAL OBJECTS
+ * http://expressjs.com/en/api.html#express.json
+ * ******************************************************************************************* */
+
+```Methods```;
+
+`express.json([options]);`
+
+options: `
+inflate                   // to manage the deflated bodies like enabling and disabling
+
+limit                     // Controls the maximum request body size.
+
+reviver                   // It is passed directly to JSON.parse as an second argument
+
+type                      // This is used to determine the type of middleware will parse
+
+verify                    // It is an undefined function which used to verify the middleware parsing.
+
+`;
+
+`express.raw([options]);`
+
+options: `
+inflate                   // to manage the deflated bodies like enabling and disabling
+
+limit                     // Controls the maximum request body size.
+
+type                      // This is used to determine the type of middleware will parse
+
+verify                    // It is an undefined function which used to verify the middleware parsing.
+`;
+
+`express.Router([options]);`
+
+options: `
+caseSensitive             //Enables case sensitivity
+
+mergeParams               //if param names of child and parent are conflicted then the child takes the precedence
+
+strict                    // Enables Strict routing
+`;
+
+`express.static(root, [options]);`
+
+options: `
+dotfiles                 // determines how dotfiles are used
+
+etag                     // Operates etag generation
+
+extensions               // Operates file extension fallback
+
+fallthrough              //	Enable or disable the immutable directive in the Cache-Control response header
+
+index                    // sends the specified directory index file
+
+LastModified             // sets the Last-Modified header to the last modified date
+
+setHeaders               // Function for setting HTTP headers to serve with the file
+`;
+
+`express.text([options]);`
+
+options: `
+defaultCharset          // Sets the default charset for the text context.
+
+inflate                 // to manage the deflated bodies like enabling and disabling
+
+limit                   // Controls the maximum request body size.
+
+type                    // This is used to determine the type of middleware will parse
+
+verify                  // It is an undefined function which used to verify the middleware parsing.
+`;
+
+`express.urlencoded([options]);`
+
+options: `
+extended                // it allows to choose between parsing the URL-encoded data or the qs library
+
+parameterLimit          // It controls the no of params.
+
+inflate                 // to manage the deflated bodies like enabling and disabling
+
+limit                   // Controls the maximum request body size.
+
+type                    // This is used to determine the type of middleware will parse
+
+verify                  // It is an undefined function which used to verify the middleware parsing.
+`;
+
+```Application`````;
+Properties```app.local`;
+
+`app.locals.title = "My Cheatsheet";
+
+console.dir(app.locals.title)`;                     `// Creating objects with local variables`
+
+app.mountpath`
+
+``app.mountpath``const admin = express()
+admin.get('/', function(req,res){
+    console.log(admin.mountpath)
+    res.send('Admin Homepage')
+})                            
+
+app.use('<admin dir>', admin)`;                    `// Mounting a sub - app`
+
+``Event``
+
+`admin.on('mount', (parent){
+    console.log('Admin Mounted')
+})`                                                `// Mounting on a parent app`
+
+``Methods``
+`app.get('/', function(req, res){
+    res.send('GET request to message')
+})`                                               `// get requests to the specified path`
+
+`app.post('/', function(req,res){
+    res.send('POST request to a webpage')
+})`                                               `// post request to the specified path`
+
+`app.put('/', function(req,res){
+    res.send('PUT request to a webpage')
+})`                                               `// post request to the specified path`
+
+`app.delete('/', function(req,res){
+    res.send('DELETE request to a webpage')
+})`                                               `// delete request to the specified path`
+
+`app.all('/', function(req,res,next){
+    console.log('Accessing the secret section....')
+    next()
+})`                                               `// Routing all types of HTTP request`
+
+`app.param('user', function(req,res,next){
+    User.find(id, function(err, user){
+        if(err){
+            next(err)
+        } else if (user){
+            req.user = user
+            next()
+        } else {
+            next(new Error('Failed to load user'))
+        }
+    })
+})`                                               `// Adding callback trigger to route parameters`
+
+`app.use(function(req,res,next){
+    res.send('Hey There!')
+})`                                               `// To Invoke the middleware layer that you want to add`
+
+```Request```
+``Methods``
+
+`req.get('content-type')`                         `// Returns the specified HTTP req header`
+
+`req.accepts('html')`                             `// Checks if the specified content types are available or not`
+
+`req.is('json')`                                  `// Requests the matching content-type`
+    
+`var range = req.range(1000)
+if (range.type === 'bytes'){
+    range.forEach(function(r){
+        // Your code
+    })
+}`                                                `// Range header parser`
+    
+``Properties``
+
+`req.param('name')`                               `// Requests the param name when present`
+    
+`app.post('/', function (req, res, next) {
+    console.log(req.body)
+    res.json(req.body)
+})`                                                `// Data submitted in the request body`
+
+`console.dir(req.cookies.name)`                    `// Contains cookies sent by the request`
+
+`console.dir(req.query.q)`                         `// Query string parameter in the route`
+
+`console.log(req.route)
+res.send('GET')`                                   `// Outputs all the layer, methods, path`
+
+`console.dir(req.signedCookies.user)`              `// Logs all the signed cookies sent by the request`
+
+
+```Response```
+``Methods``
+        
+`res.redirect('https://google.com')`               `// Redirects to the intended page`
+
+`res.send({message: 'Awesome Stuffs'})`            `// Response to the webpage` 
+        
+`res.json({alert: 'awesomecheatsheets'})`          `// Response in JSON type`
+
+`const file = req.params.name;
+res.sendFile(file, options, function(err){
+    if(err){
+        next(err)
+    }else{
+        console.log('Sent:', file)
+    }
+})`                                                `// Sends file to the intended path`
+
+`res.render('index')`                              `// Rendering the intended file`
+
+```BodyParser```
+    
+`const BodyParser = require('body-parser')
+app.use(BodyParser.json())
+app.use(BodyParser.urlencoded({
+    extended: true
+}))`                                               `// Parses incoming request bodies`