Get cookie by name

Question

I have a getter to get the value from a cookie    Now I have 2 cookies by the name shares  and by the name obligations      I want to make this getter only to get the values from the obligations cookie    How do I do this  So the for splits the data into separate values and puts it in an array    function getCookie1            What do I have to add here to look only in the  obligations   cookie          Because now it searches all the cookies       var elements   document cookie split           var obligations  elements 1  split           for  var i   0  i  lt  obligations length - 1  i              var tmp   obligations i  split               addProduct1 tmp 0   tmp 1   tmp 2   tmp 3

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My one linear function to get the value cookie by its key.

cookie = key=>((new RegExp((key || '=')+'=(.*?); ','gm')).exec(document.cookie+'; ') ||['',null])[1]

Call cookie function as

cookie('some-key')

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I would do something like this   function getCookie cookie     return cookie      trim        split           map function line  return line split              reduce function props line          var name   line 0  slice 0 line 0  search              var value   line 0  slice line 0  search              props name    value        return props                This will return your cookie as an object   And then you can call it like this   getCookie document cookie   shares

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I would prefer using a single regular expression match on the cookie   window getCookie   function name      var match   document cookie match new RegExp           name                   if  match  return match 2       OR Also we are able to use as a function   check below code   function check cookie name name               var match   document cookie match new RegExp           name                       if  match            console log match 2                  else             console log  --something went wrong---                   Improved thanks to Scott Jungwirth in the comments

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kirlich gave a good solution  However  it fails when there are two cookie values with similar names  here is a simple fix for this situation   function getCookie name      var value          document cookie    var parts   value split        name           if  parts length  gt   2  return parts pop   split      shift

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I know it is an old question but I came across this problem too  Just for the record  There is a little API in developers mozilla web page   Yoy can get any cookie by name using only JS  The code is also cleaner IMHO  except for the long line  that I m sure you can easily fix    function getCookie sKey        if   sKey    return null        return decodeURIComponent document cookie replace new RegExp                s     encodeURIComponent sKey  replace    -        g       amp         s      s                       1       null      As stated in the comments be aware that this method assumes that the key and value were encoded using encodeURIComponent    Remove decode  amp  encodeURIComponent   if the key and value of the cookie were not encoded

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It seems to me you could split the cookie key-value pairs into an array and base your search on that   var obligations   getCookieData  obligations      Which runs the following   function getCookieData  name         var pairs   document cookie split                count   pairs length  parts       while   count--             parts   pairs count  split               if   parts 0      name               return parts 1             return false      Fiddle  http   jsfiddle net qFmPc   Or possibly even the following   function getCookieData  name         var patrn   new RegExp        name                        patr2   new RegExp        name                    if   match    document cookie match patrn     document cookie match patr2             return match 1       return false

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use a cookie getting script   function readCookie name        var nameEQ   name            var ca   document cookie split           for var i 0 i  lt  ca length i              var c   ca i           while  c charAt 0        c   c substring 1 c length           if  c indexOf nameEQ     0  return c substring nameEQ length c length             return null      then call it   var value   readCookie  obligations      i stole the code above from quirksmode cookies page  you should read it

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reference  https   developer mozilla org en-US docs Web API Document cookie  document cookie    test1 Hello   document cookie    test2 World    var cookieValue   document cookie replace              s  test2 s    s                      1       alert cookieValue

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Document cookie The Document property cookie lets you read and write cookies associated with the document  It serves as a getter and setter for the actual values of the cookies   var c    Yash           Yash-777   document cookie   c     Set the value   Yash Yash-777  document cookie         Get the value  Yash Yash-777    From Google GWT project Cookies java class native code  I have prepared the following functions to perform actions on Cookie   Function to get all the cookies list as JSON object   var uriEncoding   false  function loadCookiesList         var json   new Object        if  typeof document      undefined             return json             var docCookie   document cookie      if  docCookie  amp  amp  docCookie                var crumbs   docCookie split              for  var i   crumbs length - 1  i  gt   0  --i            var name  value          var eqIdx   crumbs i  indexOf               if  eqIdx    -1              name   crumbs i             value                 else             name   crumbs i  substring 0  eqIdx             value   crumbs i  substring eqIdx   1                     if  uriEncoding              try               name   decodeURIComponent name               catch  e                   ignore error  keep undecoded name                       try               value   decodeURIComponent value               catch  e                   ignore error  keep undecoded value                               json name    value                    return json       To set and Get a Cookie with a particular Name   function getCookieValue name        var json   loadCookiesList        return json name      function setCookie name  value  expires  domain  path  isSecure        var c   name         value      if   expires    null            if  typeof expires      number                    https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Date now             var timeInMs   Date now                if  expires  gt  timeInMs                     console log  Seting Cookie with provided expire time                     c      expires      new Date expires   toGMTString                  else if  expires  lt  timeInMs                    console log  Seting Cookie with Old expire time  which is in Expired State                     timeInMs   new Date timeInMs   1000   expires                   c      expires      new Date timeInMs   toGMTString                            else if  expires instanceof window Date                c      expires     expires toGMTString                         if  domain    null  amp  amp  typeof domain     string         c      domain     domain      if  path    null  amp  amp  typeof path     string         c      path     path      if  isSecure    null  amp  amp  typeof path     boolean         c      secure        if  uriEncoding            encodeURIComponent String name                replace    23 24 26 2B 5E 60 7C  g  decodeURIComponent               replace         g  escape           encodeURIComponent String value                replace    23 24 26 2B 3A 3C 3E 3D 2F 3F 40 5B 5D 5E 60 7B 7D 7C  g  decodeURIComponent              document cookie   c     function removeCookie name        document cookie   name      expires Fri  02-Jan-1970 00 00 00 GMT      function removeCookie name  path        document cookie   name      path     path     expires Fri  02-Jan-1970 00 00 00 GMT       Checks whether a cookie name is valid  can t contain                or whitespace  Can t begin with     function isValidCookieName name        if  uriEncoding             check not necessary       return true        else if  name includes         name includes         name includes         name startsWith         spacesCheck name            return false        else         return true             https   developer mozilla org en-US docs Web JavaScript Reference Global Objects RegExp test function spacesCheck name        var whitespace   new RegExp      s           var result   whitespace test name       console log  Name isContainSpace      name       result       return result      Test steps to check the above functions   setCookie  yash1    Yash-777    setCookie  yash2    Yash-Date now     Date now     1000   30   setCookie  yash3    Yash-Sec-Feature   30   setCookie  yash4    Yash-Date   new Date  November 30  2020 23 15 30      getCookieValue  yash4       Yash-Date getCookieValue  unknownkey       undefined  var t1    Yash   t2    Y    ash   t3    Yash n   spacesCheck t1      False spacesCheck t2      True spacesCheck t3      True

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Following function will return a key-value pair of the required cookie  where key is the cookie name and value will be the value of the cookie          Returns cookie key-value pair     var getCookieByName   function name        var result     -1   -1        if name            var cookieList   document cookie split               result     grep cookieList function cookie                 cookie   cookie split      0               return cookie    name                        return result

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I wrote something that might be easy to use  If anyone has some things to add  feel free to do so  function getcookie name             let cookies   document cookie      let cookiestore                cookies   cookies split  quot   quot             if  cookies 0      quot  quot   amp  amp  cookies 0  0     undefined            return undefined                 cookies forEach function cookie            cookie   cookie split                   if  cookie 0  substr 0  1                        cookie 0    cookie 0  substr 1                     cookiestore cookie 0     cookie 1                    return  name          cookiestore name    cookiestore       Usage getcookie   - returns an object with all cookies on the web page  getcookie  myCookie   - returns the value of the cookie myCookie from the cookie object  otherwise returns undefined if the cookie is empty or not set   Example    Have some cookies  -  document cookie    quot myCookies delicious quot   document cookie    quot myComputer good quot   document cookie    quot myBrowser RAM hungry quot       Read them console log   quot My cookies are  quot    getcookie  myCookie         Outputs  My cookies are delicious  console log   quot My computer is  quot    getcookie  myComputer         Outputs  My computer is good  console log   quot My browser is  quot    getcookie  myBrowser         Outputs  My browser is RAM hungry  console log  getcookie         Outputs   myCookie   quot delicious quot   myComputer   quot good quot   myBrowser   quot RAM hungry quot        does cookie exist   if  getcookie  hidden cookie          console log  Hidden cookie was found       else       console log  Still no cookie  -            do any cookies exist   if  getcookie          console log  quot You ve got cookies to eat  quot      else       console log  No cookies for today  -

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always works well   function getCookie cname        var name   cname                ca   document cookie split               i          c          ca length   ca length      for  i   0  i  lt  ca length  i    1            c   ca i           while  c charAt 0                         c   c substring 1                     if  c indexOf name      -1                return c substring name length  c length                       return        function setCookie variable  value  expires seconds        var d   new Date        d   new Date d getTime     1000   expires seconds       document cookie   variable         value      expires     d toGMTString              No requirements for jQuery or anything  Pure old good JavaScript

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You can use js-cookie library to get and set JavaScript cookies   Include to your HTML    lt script src  https   cdn jsdelivr net npm js-cookie 2 src js cookie min js  gt  lt  script gt    To create a Cookie   Cookies set  name    value      To read a Cookie   Cookies get  name         gt   value

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Use object defineProperty  With this  you can easily access cookies  Object defineProperty window   Cookies         get  function             return document cookie split      reduce function cookies  cookie                cookies cookie split      0     unescape cookie split      1                return cookies                             From now on you can just do   alert  Cookies obligations      This will automatically update too  so if you change a cookie  the Cookies will change too

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If you just need to check if some cookie exist then simple do this   document cookie split  logged true   length    2   if cookie logged true exist  you will get 2  if not 1   logged true - change this to you cookie name value  or just a name

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set by javascript  document cookie    cookiename tesing     get by jquery with the jquery-cookie plugin  var value     cookie  cookiename     alert value

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function GetCookieValue name        var found   document cookie split      filter c   gt  c trim   split      0      name       return found length  gt  0   found 0  split      1    null

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A functional approach to find existing cookies  It returns an array  so it supports multiple occurrences of the same name  It doesn t support partial key matching  but it s trivial to replace the     in the filter with a regex   function getCookie needle        return document cookie split      map function cookiestring            cs   cookiestring trim   split                if cs length     2                return   name    cs 0    value    cs 1              else               return   name         value                               filter function cookieObject             return  cookieObject name     needle

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Just use the following function  a pure javascript code   const getCookie    name    gt     const cookies   Object assign        document cookie split       map cookie   gt        const name   cookie split      0       const value   cookie split      1        return   name   value             return cookies name

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function getCookie cname      var name   cname    quot   quot     var ca   document cookie split         for var i   0  i  lt  ca length  i          var c   ca i       while  c charAt 0                  c   c substring 1             if  c indexOf name     0          return c substring name length  c length               return  quot  quot      Pass the cookie name to getCookie   function to get it s value

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In my projects I use following function to access cookies by name  function getCookie cookie        return document cookie split      reduce function prev  c            var arr   c split               return  arr 0  trim       cookie    arr 1    prev         undefined

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Apparently MDN has never heard of the word-boundary regex character class  b  which matches contiguous  w  that is bounded on either side with  W    getCookie   function name        var r   document cookie match    b    name              b        return r   r 1    null      var obligations   getCookie  obligations

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function getCookie name        var pair   document cookie split       find x   gt  x startsWith name            if  pair         return pair split      1

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My solution is this   function getCookieValue cookieName        var ca   document cookie split            return   find ca  function  cookie            return cookie indexOf cookieName      0              This function uses the Underscorejs   find-function  Returns undefined if cookie name doesn t exist

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Here is a pretty short version   function getCookie n        let a        document cookie   match     s   n                 return a   a 1            Note that I made use of ES6 s template strings to compose the regex expression

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now you can get cookies to return as an array when you stored cookies in an array format  for example your cookie is array 35  Kh  a  array 36  T   array 37  C a   and this code with utf8 too  one thing doesn t work well when your cookie name content    in it and you store the cookies is not in the array   function getCookie cname                 var ca   decodeURIComponent document cookie  split                     if  cname indexOf        gt  0                    var returnVAlue                       var nameArray   cname replace                             for var i   0  i  lt  ca length  i                          var c   ca i                         console log c                       while  c charAt 0                                    c   c substring 1                                              if  c indexOf nameArray   gt   0                            var valueString   c substr nameArray length  c length                            var valueStringSlit   valueString split                               valueStringSlit 0    valueStringSlit 0  substr 1  valueStringSlit 0  length - 2                              console log valueStringSlit                            returnVAlue push valueStringSlit                                                         else                   var returnVAlue                       var name   cname                         for var i   0  i  lt  ca length  i                          var c   ca i                         console log c                       while  c charAt 0                                    c   c substring 1                                             if  c indexOf name     0                            returnVAlue   c substr name length  c length                                                                        if  returnVAlue                         return returnVAlue                             return                          console log decodeURIComponent document cookie              console log getCookie  array

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Simple function for Get cookie with cookie name   function getCookie cn        var name   cn          var allCookie   decodeURIComponent document cookie  split           var cval           for var i 0  i  lt  allCookie length  i              if  allCookie i  trim   indexOf name     0                cval   allCookie i  trim   split                              return  cval length  gt  0    cval 1

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4 years later  ES6 way simpler version   function getCookie name      let cookie         document cookie split      forEach function el        let  k v    el split           cookie k trim      v         return cookie name       I have also created a gist to use it as a Cookie object  e g   Cookie set name value  and Cookie get name   This read all cookies instead of scanning through  It s ok for small number of cookies

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I have done it this way  so that i get an object to access to separate the values With this u can pass the cookie to the parent and then you can access your values by the keys like   var cookies getCookieVal mycookie   alert cookies mykey   function getCookieVal parent                var cookievalue     cookie parent  split   amp                 var obj                     each cookievalue  function  i  v                    var key   v substr 0  v indexOf                        var val   v substr v indexOf        1  v length                    obj key    val                               return obj

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Cookies example  example JS   document cookies        create   function key  value  time        if  time             var date   new Date             date setTime date getTime    time 24 60 60 1000             var expires      expires   date toGMTString                else var expires            document cookie   key     value expires    path              erase   function key        this create key    -1            read   function key        var keyX   key             var ca   document cookie split            for var i 0 i  lt  ca length  i              var c   ca i           while  c charAt 0        c   c substring 1 c length             if  c indexOf keyX     0  return   c substring keyX length c length               return null           Store arrays and objects with json or xml

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I like to use a closure for getting cookie values by name  The closure below will allow you to get a cookie value by name but will only parse the cookie string if it has been updated   You can retrieve the value of a cookie with the following    var foo   cookies get   bar       Code   var cookies     function         var cookieString   null      var cookieArray            function getValOf  name             if   newCookies                   parseCookieString                     return cookieArray  name                  Check if new cookies have been added     function newCookies             return cookieString     document cookie             function parseCookieString             cookieString   document cookie              Separate cookies         var cookies   cookieString split                     Empty previous cookies         cookieArray                   Update cookieArray with new name-value pairs         for   var i in cookies                     Separate name and value             var nameVal   cookies  i   split                     var name   nameVal  0   trim                var value   nameVal  1   trim                    Add cookie name value pair to dictionary             cookieArray  name     value                       return                           Returns value or undefined                     get  function  name                 return getValOf  name

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Here is a one liner to get a cookie with a specific name without the need of any external lib    var cookie         document cookie  split    YOUR COOKIE NAME    pop   split      shift      This answer is based on kirlich s brilliant solution  The only compromise of this solution is  that you will get an empty string when the cookie does not exist  In most cases this should not be a deal breaker  though

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If you use jQuery I recommend you to use this plugin   https   github com carhartl jquery-cookie https   github com carhartl jquery-cookie blob master jquery cookie js   lt script type  text javascript   src    cdnjs cloudflare com ajax libs jquery-cookie 1 4 1 jquery cookie min js  gt    So you can read cookie like this   var value     cookie  obligations      Also you can write cookie     cookie  obligations    new value      cookie  obligations    new value     expires  14  path            Delete cookie     removeCookie  obligations

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I have modified the function that Jonathan provided here  by using regular expression you can get a cookie value by its name like this   function getCookie name       var pattern   RegExp name                  var matched   document cookie match pattern      if matched           var cookie   matched 0  split              return cookie 1            return false     If it returns empty string it means that the cookie exists but has no value  if it returns false then the cookie doesn t exist  I hope this helps

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Just to add an  official  answer to this response  I m copy pasting the solution to set and retrieve cookies from MDN  here s the JSfiddle      document cookie    test1 Hello       document cookie    test2 World        var cookieValue   document cookie replace              s  test2 s    s                      1         function alertCookieValue           alert cookieValue           In you particular case  you would use the following function      function getCookieValue           return document cookie replace              s  obligations s    s                      1            Note that i only replaced  test2  from the example  with  obligations

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Get cookie by name just pass the name of cookie to below function  function getCookie cname      var name   cname          var decodedCookie   decodeURIComponent document cookie     var ca   decodedCookie split         for var i   0  i  lt ca length  i          var c   ca i       while  c charAt 0                  c   c substring 1             if  c indexOf name     0          return c substring name length  c length               return

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One approach  which avoids iterating over an array  would be    function getCookie name      const value        document cookie      const parts   value split      name        if  parts length     2  return parts pop   split      shift        Walkthrough  Splitting a string by token will produce either  an array with one string  same value   in case token does not exist in a string  or an array with two strings   in case token is found in a string     The first  left  element is string of what was before the token  and the second one  right  is what is string of what was after the token    NOTE  in case string starts with a token  first element is an empty string   Considering that cookies are stored as follows     name   value    name   value          in order to retrieve specific cookie value  we just need to get string that is after     name    and before next      Before we do any processing  we prepend the cookies string with       so that every cookie name  including the first one  is enclosed with      and           name   value    name   value          Now  we can first split by     name     and if token is found in a cookie string  i e  we have two elements   we will end up with second element being a string that begins with our cookie value  Then we pull that out from an array  i e  pop   and repeat the same process  but now with     as a token  but this time pulling out the left string  i e  shift  to get the actual token value

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Object fromEntries document cookie split       map v  gt v split      map decodeURIComponent     One liner to convert cookie into JavaScript Object or Map new Map document cookie split       map v  gt v split      map decodeURIComponent

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The methods in some of the other answers that use a regular expression do not cover all cases  particularly   When the cookie is the last cookie  In this case there will not be a semicolon after the cookie value  When another cookie name ends with the name being looked up  For example  you are looking for the cookie named  quot one quot   and there is a cookie named  quot done quot   When the cookie name includes characters that are not interpreted as themselves when used in a regular expression unless they are preceded by a backslash   The following method handles these cases  function getCookie name        function escape s    return s replace                           g      1          var match   document cookie match RegExp          s      escape name                      return match   match 1    null     This will return null if the cookie is not found  It will return an empty string if the value of the cookie is empty  Notes   This function assumes cookie names are case sensitive  document cookie - When this appears on the right-hand side of an assignment  it represents a string containing a semicolon-separated list of cookies  which in turn are name value pairs  There appears to be a single space after each semicolon  String prototype match   - Returns null when no match is found  Returns an array when a match is found  and the element at index  1  is the value of the first matching group   Regular Expression Notes      xxxx  - forms a non-matching group    - matches the start of the string    - separates alternative patterns for the group     s  - matches one semi-colon followed by zero or more whitespace characters    - matches one equal sign   xxxx  - forms a matching group        - matches zero or more characters other than a semi-colon  This means it will match characters up to  but not including  a semi-colon or to the end of the string

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There are already nice answers here for getting the cookie However here is my own solution    function getcookie cookiename   var cookiestring    document cookie  var cookiearray   cookiestring split       for var i  0   i  lt  cookiearray length     i        if cookiearray i  trim   match     cookiename                 return cookiearray i  replace    cookiename        trim            return null      usage          getcookie  session id          gets cookie with name session id

[javascript] Get cookie by name

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