Cookies are created using the document.cookie property, which allows you to set a string containing the cookie's name, value, and optional attributes like expiration date and path.
You can access the document.cookie property to read all cookies associated with the current page. However, this property returns a single string with all the cookies, so parsing is required.
Updating a cookie involves setting a new value for the same cookie. You can use the same method as creating cookies.
To delete a cookie, you can set its expiration date to a past date.
Limitations and Considerations
- Cookies have limited storage capacity (typically around 4KB per domain).
- Cookies are sent with every HTTP request, which might impact performance.
- Cookies are not secure for sensitive data because they can be viewed and manipulated by the user.
- Modern web development often uses more secure methods like localStorage and sessionStorage for client-side storage.
A common use case for cookies is implementing a simple "Remember Me" feature on a login page:
In this scenario, the cookie retains the username, allowing the user to remain logged in even after closing the browser.
While cookies offer basic persistent storage, it's important to be aware of their limitations and potential security concerns.