Added express module, also updated README file.

README.md

@@ -52,3 +52,4 @@ Feel free to contribute.
 - [Node.js Sequelize Module Code Example](./sequelize-module)
 - [Node.js Console Module Code Example](./console-module)
 - [Node.js Errors Module Code Example](./errors-module)
+- [Node.js Express Module Code Example](./express-module)

express-module/Readme.md

@@ -0,0 +1,24 @@
+## express
+
+express is a web framework in Node.js which helps providing easy server creation, routing and adding middleware capabilities.
+
+## How to install sequelize and RDBMS associated driver
+
+To install the express dependency run the following command:
+    npm i express
+
+
+## Node.js express module code examples
+
+Find [example code](./code/createExpressApp.js) for most creating an express application.
+
+## ToC
+
+<= [Parent](./Readme.md)
+
+- [How to create an express application](./code/createExpressApp.js))
+- [How to create get API](./code/getApi.js)
+- [How to create post API](./code/postApi.js)
+- [How to create put API](./code/putApi.js)
+- [How to create delete API](./code/deleteApi.js)
+- [How to create a route the request using express](./code/routing.js)

express-module/code/createExpressApp.js

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+/*
+* @description : provided the way to create an express application
+*/
+
+let express = require('express'); //This returns a function which is stored in express variable
+
+let app = express();              //Here we are creating the express application, which will be having get, post, etc functionalities.

express-module/code/deleteApi.js

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+/*
+* @description : provided the way to create an delete api.
+*/
+
+let express = require('express'); //This returns a function which is stored in express variable
+
+let app = express();              //Here we are creating the express application, which will be having get, post, etc functionalities.
+
+//Get API is used to insert values and cannot be hit from browsers. To hit post api's we require special softwares like POSTMAN, curl etc.
+app.delete('/', (req, res)=>{
+    res.send("Correctly hitting the get delete API");
+})
+
+
+//Here the server is started on PORT defined in process.env file, if it doesn't exist it runs on port 8080
+app.listen(process.env.PORT || 8080, ()=>{
+    console.log("Server started successfully");
+})

express-module/code/getApi.js

@@ -0,0 +1,18 @@
+/*
+* @description : provided the way to create an get api.
+*/
+
+let express = require('express'); //This returns a function which is stored in express variable
+
+let app = express();              //Here we are creating the express application, which will be having get, post, etc functionalities.
+
+//Get API is used to retreive values and can be hit from browsers or softwares like POSTMAN etc.
+app.get('/', (req, res)=>{
+    res.send("Correctly hitting the get API");
+})
+
+
+//Here the server is started on PORT defined in process.env file, if it doesn't exist it runs on port 8080
+app.listen(process.env.PORT || 8080, ()=>{
+    console.log("Server started successfully");
+})

express-module/code/postApi.js

@@ -0,0 +1,18 @@
+/*
+* @description : provided the way to create an post api.
+*/
+
+let express = require('express'); //This returns a function which is stored in express variable
+
+let app = express();              //Here we are creating the express application, which will be having get, post, etc functionalities.
+
+//Get API is used to insert values and cannot be hit from browsers. To hit post api's we require special softwares like POSTMAN, curl etc.
+app.post('/', (req, res)=>{
+    res.send("Correctly hitting the get POST API");
+})
+
+
+//Here the server is started on PORT defined in process.env file, if it doesn't exist it runs on port 8080
+app.listen(process.env.PORT || 8080, ()=>{
+    console.log("Server started successfully");
+})

express-module/code/putApi.js

@@ -0,0 +1,18 @@
+/*
+* @description : provided the way to create an put api.
+*/
+
+let express = require('express'); //This returns a function which is stored in express variable
+
+let app = express();              //Here we are creating the express application, which will be having get, post, etc functionalities.
+
+//Get API is used to update values already present in database and cannot be hit from browsers. To hit post api's we require special softwares like POSTMAN, curl etc.
+app.put('/', (req, res)=>{
+    res.send("Correctly hitting the get PUT API");
+})
+
+
+//Here the server is started on PORT defined in process.env file, if it doesn't exist it runs on port 8080
+app.listen(process.env.PORT || 8080, ()=>{
+    console.log("Server started successfully");
+})

express-module/code/routing.js

@@ -0,0 +1,19 @@
+/*
+* @description : Routing in Express
+*   Routing is very crucial. It defines the URL structure that can be used to
+*   interact with the web application.
+*   Express apps use routers that are containers for a bunch of middleware. The
+*   middleware holder can be used on a certain route, which enables to place the logic
+*   in separate files and bring them together. 
+*/
+
+const express = require('express')
+
+let router = express.Router();
+
+const reqRouterDest = require('<Provide here the path to the controller where we need to route the request to>');
+
+router.get('<Give here the end points we need to redirect>', reqRouterDest.nameOfFunction);
+router.post('<Give here the end points we need to redirect>', reqRouterDest.nameOfFunction);
+router.put('<Give here the end points we need to redirect>', reqRouterDest.nameOfFunction);
+router.delete('<Give here the end points we need to redirect>', reqRouterDest.nameOfFunction);