Get cookie by name

Get cookie by name

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 < obligations.length - 1; i++) { var tmp = obligations[i].split('$'); addProduct1(tmp[0], tmp[1], tmp[2], tmp[3]); } }


Solution 1:

One approach, which avoids iterating over an array, would be:

function getCookie(name) {
  var value = "; " + document.cookie;
  var parts = value.split("; " + name + "=");
  if (parts.length == 2) return parts.pop().split(";").shift();


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.

Solution 2:

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('--something went wrong---');

Improved thanks to Scott Jungwirth in the comments.

Solution 3:

use a cookie getting script:

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < 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.

Solution 4:

If you use jQuery I recommend you to use this plugin:

<script type="text/javascript"

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:


Solution 5:

The methods in some of the other answers that use a regular expression do not cover all cases, particularly:

  1. When the cookie is the last cookie. In this case there will not be a semicolon after the cookie value.
  2. When another cookie name ends with the name being looked up. For example, you are looking for the cookie named “one”, and there is a cookie named “done”.
  3. 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.


  1. This function assumes cookie names are case sensitive.
  2. 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.
  3. 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:

  1. (?:xxxx) – forms a non-matching group.
  2. ^ – matches the start of the string.
  3. | – separates alternative patterns for the group.
  4. ;\\s* – matches one semi-colon followed by zero or more whitespace characters.
  5. = – matches one equal sign.
  6. (xxxx) – forms a matching group.
  7. [^;]* – 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.

Solution 6:

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.