notes.txt

server.js file was created
npm init
npm i mongoose
mongodb.com ---> create database--> connect -->copy the connection string
create .env file in root directory
put the connection string in the .env file
npm i dotenv
create config dir --> create DBconn.js in it-->export the function --> use in server.js-->connectDB()
check if the database is connected before listening to the port. And only listen if the DB is connected
write the builtin middlewares:
        To handle urlencoded data/form data 
        For json 
        For serving static files  //self:-  setting folder for serving css files
create the html pages in the views folder: index.html, 404.html, new-page.html .Link the css file to it.Which is present in the public folder in root dir. : public/css/style.css
create a routes folder
create a router for root page /index page -> root.js
        write the code in root.js to serve the html files
        the import this router in main server.js file
create mongoose schema for Users and Employee:
        create User.js and Employee.js in model folder
        create the mongoose schema in them

create a registration route and registerController to register new user
        npm i bcrypt
        check for ./public/img/rregisterNewUserPOSTRequest.png  It is the screenshot of the post request=>registration of new user
npm i cors
create auth route and authController to login existing user
        npm i jsonwebtoken
        npm i cookie-parser
        add ACCESS_TOKEN_SECRET and REFRESH_TOKEN_SECRET in .env file using:-> require('crypto').randomBytes(64).toString('hex')
create verifyJWT middleware
create employee route in api folder in routers folder. And create employeeController to GET,PUT,POST,DELETE an employee.
Add ROLES_LIST in config folder.
Add verifyRoles. And use it in employeesRoute to verify roles before getting/updating/creating/deleting an employee