How to Delete a Cookie Value?

Deleting a cookie value can be achieved through various methods, depending on the programming language and environment you are using. Here are some general methods and examples:

To delete a cookie in client-side JavaScript, set the cookie's expiration time to a past date. This instructs the browser that the cookie has expired, which causes the browser to delete it.

javascript
function deleteCookie(name) {
    document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}

Using this function, you simply need to pass the name of the cookie you wish to delete.

If you are working on the server side, such as with the Express framework in Node.js, set the response headers to instruct the browser to delete a cookie.

javascript
res.clearCookie('cookieName');

This line of code sets a response header to clear the cookie named cookieName.

In PHP, delete a cookie by setting a negative expiration time.

php
setcookie("cookieName", "", time() - 3600);

The above code sets the expiration time of cookieName to one hour ago, which causes it to be deleted.

If you are using the Flask framework, utilize the response object to delete a cookie.

python
from flask import make_response

@app.route('/delete-cookie')
def delete_cookie():
    response = make_response('Cookie has been deleted')
    response.set_cookie('cookieName', '', expires=0)
    return response

This code creates a response object and uses the set_cookie method to set the value of cookieName to an empty string and the expiration time to 0, causing the browser to delete this cookie.

Summary:

Typically, deleting a cookie involves setting its expiration time to a past date, which tells the browser that the cookie has expired and it will automatically delete it. Different programming languages and frameworks have their own functions or methods to achieve this. It is important to ensure that you send the correct HTTP headers so that the browser knows which cookie to delete.

In JavaScript, deleting a cookie:

In HTTP response, deleting a cookie:

In PHP, deleting a cookie:

In Python's Flask framework, deleting a cookie:

Summary: