statemanagement in nodejs | nodejs tutorials

staetemenage storing cooking to identify users 

state management

one client make request with web form

client requested data send to backend

then it will responds

but requested data not tehre

to store taht data

we use statemanagement

we will use different type of module to use statemanagement

sm has two major parts

client side- client side manage management

server side- it is called as servr side management

client side - cookies

serverside - sessions

register teh cookie and remove the cookie using get method api

stored to browser cokokie

i not entered any expiry data

so it will remove automatically whenever browser closed

in below programm set the cookie and remove the cookie

var express = require('express');

var cookieParser = require('cookie-parser');

var app = express();

app.use(cookieParser());

app.get('/',

function (req,res)

{

res.cookie('mycookie', 'tutorials point video tutorials');

res.end('hi there');

}

);

app.get('/remove',

function (req,res)

{

res.clearCookie("mycookie");

res.end('hi there');

}

);

app.listen(8081,

function () {

console.log("server started");

});

encrypt cookie

app.use sesion - secret - encryt, save initialise- if u not do any change in cokokie in their time it will be like original

when login is done - it will false

max age is 60000 milli seconds

var express = require('express');

var cookieParser = require('cookie-parser');

var session= require("express-session");

var morgan = require("morgan");

var app = express();

app.use(morgan('dev'));

app.use(cookieParser());

app.use(session({secret: 'secretkey', saveUnitialised:true, resave: true, cookie: {maxAge: 60000}}));

app.get('/',

function (req,res,next)

{

if(req.session.views)

{

req.session.views++;

res.setHeader('Content-Type','text/html')

res.write('<p> views:' + req.session.views +'</p>')

res.write('<p> expires in:' + (req.session.cookie.maxAge / 1000) +'</p>')

res.end()

}

else {

req.session.views=1

res.end('refresh page')

}

}

);

app.listen(8081,

function () {

console.log("server started");

});

ist prints in browser 

prints 

refresh 

after refresh 

taht count increses

after one idle minute - no refresh - session expires

it will show refresh