InNodeJShttplibraryhasAccesstotheHeaderComponentandHenceitcanalsoaccessCookies.

ReadingCookiesfromHTTPHeadersandWritingourowncookiesparsingfunctionismostreliablethanusingcurrentlyexistingCookiesrelatednodepackages.

varhttp=require('http');

ThehttphasaccesstotherequestandresponseobjectsoftheHTTPrequest.

Fromtherequestobjectwecanreadthealreadysetcookiesandotherheaders,whilewecanwritetheresponseheaderstoinstructthebrowserstomanipulatethecookies.

Theentireexisting(alreadyset)cookiesarestoredintherequest.headers.cookie.

Thecookieswerecieveisasfollows:

cookie1=val1;cookie2=val2

NodeJSWorkingwithCookies1.Introduction

2.ReadingandParsingCookies

2.1Requirehttp

2.2ParsingCookies

Nowlet'stryparsingthecookiestringtoJSON:

Steps:

1. TrimtheCookieStringtogetKey-Valuepairbysplit(';')2. TrimtheCookiebysplit('=')3. WriteeachKey-ValuepairtoJSON

ParseFunction:

functionparseCookies(request){varlist={},rc=request.headers.cookie;rc&&rc.split(';').forEach(function(cookie){varparts=cookie.split('=');list[parts.shift().trim()]=decodeURI(parts.join('='));});returnlist;}

Thisparsefunctionwillenablereadcookiesflawlessly.

WecaneasilysetthecookiesorupdateexistingvaluesbyusingsetHeader()function.

Functiontosetcookies:

response.setHeader('Set-Cookie',+['cookie1='+valcookie1,+'cookie2'+valcookie2+]);

NOTE:ifweoverwritetheSet-Cookie,thepreviousvaluewillbelost,henceweneedtoreadandappendallcookiesatthesametime.

Toovercomethisissue,wecangettheheadercookiestringreq.headers.cookieandappendtheupdatedcookiestothetrailingpartoftheCookiestring.

2.3SettingorUpdatingCookies

FindthefollowingcodesnippettoSet-Updatecookiesusingthemethodasdiscussedabove:

varhttp=require('http');functionparseCookies(request){varlist={},rc=request.headers.cookie;rc&&rc.split(';').forEach(function(cookie){varparts=cookie.split('=');list[parts.shift().trim()]=decodeURI(parts.join('='));});returnlist;}http.createServer(function(request,response){//ToReadaCookievarcookies=parseCookies(request);console.log('JSON='+JSON.stringify(cookies));setCookies=[];if(cookies!={}){console.log(cookies.count+"\n");varcount=parseInt(cookies.count);count=count+1;setCookies.push("count="+count);}else{varcount=0;vardummy="something";setCookies.push("count="+count);setCookies.push("dummy+"+dummy);}//ToWriteaCookieresponse.setHeader("Set-Cookie",setCookies);console.log(response.headers.cookie);response.end('HelloWorld\nTheCountis'+count);}).listen(3000);console.log('Serverrunningathttp://localhost:3000/');

2.4SampleCookieSet-Update.