This simple slideshare gives an Illustration of working with cookies in NodeJS. There is always a confusion of working with cookies and of which NPM to select when working with Cookies, Hope this removes all confusion.

1. In NodeJS http library has Access to the Header Component and Hence it can
also access Cookies.
Reading Cookies from HTTP Headers and Writing our own cookies parsing
function is most reliable than using currently existing Cookies related node
packages.
var http = require('http');
The http has access to the request and response objects of the HTTP
request.
From the request object we can read the already set cookies and other
headers, while we can write the response headers to instruct the browsers to
manipulate the cookies.
The entire existing (already set) cookies are stored in the
request.headers.cookie .
The cookies we recieve is as follows :
cookie1=val1; cookie2=val2
NodeJS Working with Cookies
1. Introduction
2. Reading and Parsing Cookies
2.1 Require http
2.2 Parsing Cookies

2. Now let's try parsing the cookie string to JSON :
Steps :
1. Trim the Cookie String to get Key-Value pair by split(';')
2. Trim the Cookie by split('=')
3. Write each Key-Value pair to JSON
Parse Function :
function parseCookies (request) {
var list = {},
rc = request.headers.cookie;
rc && rc.split(';').forEach(function( cookie ) {
var parts = cookie.split('=');
list[parts.shift().trim()] = decodeURI(parts.join('='));
});
return list;
}
This parse function will enable read cookies flawlessly.
We can easily set the cookies or update existing values by using setHeader()
function.
Function to set cookies :
response.setHeader('Set-Cookie',
+ ['cookie1='+valcookie1,
+ 'cookie2'+valcookie2
+ ]);
NOTE : if we overwrite the Set-Cookie , the previous value will be lost, hence we
need to read and append all cookies at the same time.
To overcome this issue, we can get the header cookie string req.headers.cookie
and append the updated cookies to the trailing part of the Cookie string.
2.3 Setting or Updating Cookies

3. Find the following code snippet to Set-Update cookies using the method as
discussed above :
var http = require('http');
function parseCookies (request) {
var list = {},
rc = request.headers.cookie;
rc && rc.split(';').forEach(function( cookie ) {
var parts = cookie.split('=');
list[parts.shift().trim()] = decodeURI(parts.join('='));
});
return list;
}
http.createServer(function (request, response) {
// To Read a Cookie
var cookies = parseCookies(request);
console.log('JSON = ' + JSON.stringify(cookies));
setCookies=[];
if(cookies!={}) {
console.log(cookies.count+"n");
var count=parseInt(cookies.count);
count = count+1;
setCookies.push("count="+count);
} else {
var count=0;
var dummy="something";
setCookies.push("count="+count);
setCookies.push("dummy+"+dummy);
}
// To Write a Cookie
response.setHeader("Set-Cookie",setCookies);
console.log(response.headers.cookie);
response.end('Hello Worldn The Count is ' + count);
}).listen(3000);
console.log('Server running at http://localhost:3000/');
2.4 Sample Cookie Set-Update.