How do I set cookie expiration in JavaScript?

How do I set cookie expiration in JavaScript?

You can set cookie expiration by using the 'expires' attribute in the cookie string. For example: 'expires=Fri, 31 Dec 2023 23:59:59 GMT'.

Can you show me a code example?

Sure! Here's a simple example:

function setCookie(name, value, days) {
    let expires = '';
    if (days) {
        const date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = '; expires=' + date.toUTCString();
    }
    document.cookie = name + '=' + (value || '') + expires + '; path=/';
}
setCookie('myCookie', 'cookieValue', 7); // Expires in 7 days

What if I want the cookie to expire when the browser is closed?

In that case, you can simply omit the 'expires' attribute. The cookie will be a session cookie and will expire when the browser is closed.

Thanks! Is there a way to check if a cookie has expired?

Yes! You can check if a cookie exists by reading it. If it doesn't exist, it means it has either expired or was never set.