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• VS Code, Download ->https://code.visualstudio.com/download
• Node, Download-> https://nodejs.org/en/download
• MongoDB Shell(msi) , Download-> https://www.mongodb.com/try/download/shell
• MongoDB community (msi), download->(https://www.mongodb.com/try/download/community)
• Postman (Optional), Download-> https://www.postman.com/downloads/

Or Online Database (MongoDB Atlas)

• Register -> https://www.mongodb.com/cloud/atlas/register

1. Install Node.js

2. To verify installation into command form by node -v

3. For initialization npm write the query in the command window as npm init -y

4. Setup the opening file into the package.json and change the file with main:'server.js'

5. To create a server using the express package then write a query into the command window as npm install express. Write code in the server file for initialization const express = require("express"); const app = express(); app.listen(3000, () => { console.log("Server is running at http:https://localhost:3000"); });

6. Install the nodemon package for automatically running the server as- npm i --save-dev nodemon (For Developing purpose)

7. setup the package.json file in the scripts key, write

 "scripts": {
 "start": "node ./resources/backend/server.js",
 "dev": "nodemon ./resources/backend/server.js",
 "test": "echo \"Error: no test specified\" && exit 1"
 },

** Run both server with one command,

1. Run the command in the root directory

 npm i concurrently

2. Setup the package.json file as->

 "scripts": {
    "server":"nodemon backend/server.js",
    "client-install":"npm install --force --prefix frontend",
    "socket-install":"npm install --force --prefix socket",
    "socket":"npm run socket --prefix socket",
    "client":"npm start --prefix frontend",
    "client-fix":"npm audit fix --force --prefix frontend",
    "dev":"concurrently \" npm run server \" \" npm run socket \" \" npm run client \""
  },

8. use the Morgan package for automatic restart. Hence install the morgan package as npm install --save-dev morgan (Development purpose) Write code in the server file for initialization const morgan = require("morgan"); app.use(morgan("dev")); --> Middlewire.
9. Install Postman software for API testing by the URL endpoint.
10. Install Mongobd + MongobdCompass and Mongoshell (For Database)

1. Install Mondodb + Mongodb Compass and Mongodb Shell download from the google.
2. Set up Environment Variable in drive:c/program file
3. Create a directory in the base path of the c drive named data. Inside the data directory create another folder db.
4. Write the command in the CMD window as Mongod. And write the other command in the other CMD window as mongosh.
5. Then Check the version as mongod --version and mongosh --version.
6. Install mongoose package as npm i mongoose
7. Create an atlas account. In the atlas account create a cluster that have a user(as atlas admin) and network access with any access IP address.
8. Connect the database using URL from the atlas cluster or local Mongodb compass using the mongoose package as mongoose. connect('mongodb:https://localhost:27017/database-name);

• React Js
• Redux
• socket.io-client
• Sass

• Programming languages : JavaScript
• Node Js
• Frameworks : Express Js
• Databases : MongoDB
• Socket.io

npm install --force

    npm run socket-install

cd frontend
npm install --force

Step-1: Run this command in root folder

```js
npm run dev
```

If application doesn't run

Step-2:

1. Again run this command in frontend folder

    npm audit fix --force

2. And run this command in root folder

   npm audit fix --force

Run this command in root folder

 npm run dev

• clone to your local machine
• npm install
• npm start
• Or, create and run react app with npx

// create react app command
npx create-react-app appName

// If any error occurs
npm install npm -g

// run react app command
cd appName
npm start

• React-js
• Node-js
• Express-js
• MongoDB
• Socket
• axios

• Real time Text Messaging
• Real time image Messaging
• Real time emoji Messaging
• Real time message seen, unseen system
• Real time message received and sending sound
• Real time received message notification system
• User search system
• User login and register system
• Application dark and light mode system

Messenger

const express = require("express"); // Create Express server
const morgan = require("morgan"); // For automatically run server
const cookieParser = require("cookie-parser"); // For set Cookie
const createError = require("http-errors"); // For create HTTP Error
const xssClean = require("xss-clean"); // For  Secure API
const bodyParser = require("body-parser"); // For Get/ Set data into body
const cors = require("cors"); // To set access for client-side URL

app.use(cookieParser()); // For set Cookie
app.use(morgan("dev")); // For automatically run server
app.use(xssClean()); // For  Secure api
app.use(bodyParser.json()); // For Set, Read data into the body and display JSON Format Text
app.use(bodyParser.urlencoded({ extended: true })); // Get HTML Form Data
app.use(setRefreshToken); // For set Refresh Token [Automatically call this middleware for all route]
// To get access to Client side URL
app.use(cors(
 {
   origin: BASE_URL, // Frontend Base URL
   credentials: true
 }
));
app.use(express.static("public")); // To Display Server site image

const io = require("socket.io")(8080, {
 cors: {
   origin: BASE_URL
 },
});
io.on("connection", (socket) => {
 console.log("User connected", socket.id);

 setInterval(() => {
   io.emit("refresh", {});
 }, 500)

 // socket.on("disconnect", function () {
 //   console.log("Disconnect");

 // })

});

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