Clear all cookie javascript

How to clear all cookies with JavaScript?

In this tutorial, we will learn to clear all cookies using JavaScript. The cookies are the text or data stored in the format of text files in the browser or user’s computer, and it is one kind of cache memory.

The developer can store the username, authentication tokens, etc., in the browser’s cookies. When a user visits the webpage for the first time, it retrieves the user information from the server and stores it in the cookie format in the browser. After that, when a user visits the webpage again, it retrieves the required data from cookies instead of the server, making the application fast and secure.

Every browser has a limit on storing cookies. The most modern browsers allow users to store cookies of the maximum size of 4kb. However, the different browser allows to store of a different number of cookies. Google chrome allows 180, and Firefox allows 150, etc.

Clear all Cookies using JavaScript

This section will look at how we can clear all cookies using JavaScript. Every cookie contains the expiry attribute, which contains the expiry date and time for the particular cookies. We can retrieve all cookies and set the past expiry date to clear all cookies.

Syntax

Users can follow the syntax below to set the past expiry date to all cookies.

In the above output, users can see the object at last in the cookies when they click on the Show cookies button. When a user clicks on the clear cookies button, it will remove objects from the cookies. Here, we have cleared all cookies which we set up.

Users have learned to clear all cookies successfully. However, users can directly go to the developer’s tool and clear the cookies. Users can follow the above example code to clear cookies from the client side using JavaScript.

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How to clear all cookies using JavaScript ?

As this attribute is configurable*, it is possible to delete all the cookies by setting the “expiry” to any value that has already passed. The cookie property of the current document is used to modify the attributes of the cookies buy using HTML DOM cookie Property .

Clearing all cookies with JavaScript

How do you delete all the cookies for the current domain using JavaScript?

function deleteAllCookies() < var cookies = document.cookie.split(";"); for (var i = 0; i < cookies.length; i++) < var cookie = cookies[i]; var eqPos = cookie.indexOf("="); var name = eqPos >-1 ? cookie.substr(0, eqPos) : cookie; document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT"; > > 

Note that this code has two limitations:

• It will not delete cookies with HttpOnly flag set, as the HttpOnly flag disables Javascript’s access to the cookie.
• It will not delete cookies that have been set with a Path value. (This is despite the fact that those cookies will appear in document.cookie , but you can’t delete it without specifying the same Path value with which it was set.)

One liner

In case you want to paste it in quickly.

document.cookie.split(";").forEach(function(c) < document.cookie = c.replace(/^ +/, "").replace(/=.*/, "=;expires=" + new Date().toUTCString() + ";path=/"); >); 

And the code for a bookmarklet :

And here’s one to clear all cookies in all paths and all variants of the domain (www.mydomain.com, mydomain.com etc):

After a bit of frustration with this myself I knocked together this function which will attempt to delete a named cookie from all paths. Just call this for each of your cookies and you should be closer to deleting every cookie then you were before.

function eraseCookieFromAllPaths(name) < // This function will attempt to remove a cookie from all paths. var pathBits = location.pathname.split('/'); var pathCurrent = ' path='; // do a simple pathless delete first. document.cookie = name + '=; expires=Thu, 01-Jan-1970 00:00:01 GMT;'; for (var i = 0; i < pathBits.length; i++) < pathCurrent += ((pathCurrent.substr(-1) != '/') ? '/' : '') + pathBits[i]; document.cookie = name + '=; expires=Thu, 01-Jan-1970 00:00:01 GMT;' + pathCurrent + ';'; >> 

As always different browsers have different behaviour but this worked for me. Enjoy.

Clearing all cookies with JavaScript, It will not delete cookies with HttpOnly flag set, as the HttpOnly flag disables Javascript’s access to the cookie. It will not delete cookies that have been set with a Path value. (This is despite the fact that those cookies will appear in document.cookie, but you can’t delete it without specifying the same Path value with which it was set.) Code samplefunction deleteAllCookies()

How to clear all cookies using JavaScript ?

Cookies provide a way for a client and server to interact and pass information via HTTP. This enables the client to store state information despite using HTTP which is a stateless protocol. When a browser requests a web page from a server, the server services the request and “forgets” about the visit. But it passes some information to the user’s browser. The browser stores the information in the form of key=value pairs and also manages this information.

• Cookie information is passed in the HTTP request header during every subsequent visit to the domain from the user’s browser.
• Information like login details, consent, other preferences are used to enhance and customize the user experience.

HTTP cookies expire, the date and time are specified in the “expires” attribute. As a result, the browser automatically deletes the cookies when the date and time exceed the expiration date (and time). As this attribute is configurable*, it is possible to delete all the cookies by setting the “expiry” to any value that has already passed.

The cookie property of the current document is used to modify the attributes of the cookies buy using HTML DOM cookie Property . The document.cookie returns a single string of all the cookies separated by semicolons associated with the current document.

Code: The code below illustrates how cookies can be deleted using JavaScript. The code is run on an online editor to demonstrate that only cookies created by your site can be deleted by the code.

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How to Clear All Cookies with JavaScript?

Sometimes, we may clear all the cookies stored in the browser for the given site.

In this article, we’ll look at how to clear all cookies with JavaScript.

Setting the Expiry Date of All Cookies to a Date Earlier than the Current Date-Time

We can clear all cookies with JavaScript by setting the expiry date of each cookie to a date and time that’s earlier than the current time.

const deleteAllCookies = () => < const cookies = document.cookie.split(";"); for (const cookie of cookies) < const eqPos = cookie.indexOf("="); const name = eqPos >-1 ? cookie.substr(0, eqPos) : cookie; document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT"; > > deleteAllCookies() 

We create the deleteAllCookies function that splits the document.cookie string.

Then we loop through each cookie within the cookies array.

And then we get the index of the = sign and remove the equal sign if it’s not there.

Then we add the expires=Thu, 01 Jan 1970 00:00:00 GMT string after it to remove the cookie by making it expire.

This won’t delete cookies with the HttpOnly flag set since the flag disables JavaScript’s access to the cookie.

It also won’t delete cookies that have a Path value set.

This is because we can’t delete it without specifying the same Path value with which it’s set.

Conclusion

We can clear some cookies from the browser by splitting the cookie string and then adding an expiry date to it that’s earlier than the current date and time.

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Clear All Cookies With JavaScript

This article will help you to clear all cookies using JavaScript.

Cookies allow clients and servers to communicate and transfer information over HTTP. It allows the client to persist state information even when using the stateless protocol HTTP.

1. Information about the cookie is sent in HTTP request headers on each subsequent visit to the domain from the user’s browser.
2. Information such as login information, consent, and other parameters improves and personalizes the user experience.

Delete All Cookies for the Current Domain Using JavaScript

The cookie attribute in the current document is used to change the attributes of a cookie purchased using the HTML DOM cookie attribute. The document.cookie returns a string of all semicolon-delimited cookies associated with the current document.

The code below shows how to delete cookies using JavaScript. The code is run on an online editor to demonstrate that the code can delete only cookies generated by your site.

 html>  head>  meta charset="utf-8">  title>  title>  head>  body>  main>  script type="text/javascript">  document.cookie = "username=shiv";  document.cookie = "CONSENT=YES+IN.en+20170903-09-0";   function displayCookies()    var displayCookies = document.getElementById("display");  displayCookies.innerHTML = document.cookie;  >   function deleteAllCookies()   var cookies = document.cookie.split(";");  for (var i = 0; i  cookies.length; i++)   var cookie = cookies[i];  var eqPos = cookie.indexOf("=");  var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;  document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT";  >  >  script>  button onclick="displayCookies()">Display Cookiesbutton>  button onclick="deleteAllCookies()">Delete Cookiesbutton>  p id="display">p>  main>  body>  html> 

The code above has two limitations.

1. Cookies with the HttpOnly flag set are not deleted because the HttpOnly flag disables JavaScript access to the cookie.
2. Cookies set as path values are not deleted. (Although these cookies appear under Deleted , they cannot be deleted without specifying the same value for the installation path.)

When you click on Display Cookies , it will display the cookies.

You can also view the cookies in the inspector.

After clicking on Delete Cookies , it will delete it, and you have to again click on display cookies to see whether it is deleted or not.

You can also see in the inspector whether it is deleted or not.

Shiv is a self-driven and passionate Machine learning Learner who is innovative in application design, development, testing, and deployment and provides program requirements into sustainable advanced technical solutions through JavaScript, Python, and other programs for continuous improvement of AI technologies.

Related Article — JavaScript Cookies

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