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JavaScript Cookies

A cookie is an amount of information that persists between a server-side and a client-side. A web browser stores this information at the time of browsing.

A cookie contains the information as a string generally in the form of a name-value pair separated by semi-colons. It maintains the state of a user and remembers the user's information among all the web pages.

How Cookies Works?

  • When a user sends a request to the server, then each of that request is treated as a new request sent by the different user.
  • So, to recognize the old user, we need to add the cookie with the response from the server.
  • browser at the client-side.
  • Now, whenever a user sends a request to the server, the cookie is added with that request automatically. Due to the cookie, the server recognizes the users.
JavaScript Cookies

How to create a Cookie in JavaScript?

In JavaScript, we can create, read, update and delete a cookie by using document.cookie property.

The following syntax is used to create a cookie:

JavaScript Cookie Example

Example 1

Let's see an example to set and get a cookie.

Example 2

Here, we display the cookie's name-value pair separately.

Example 3

In this example, we provide choices of color and pass the selected color value to the cookie. Now, cookie stores the last choice of a user in a browser. So, on reloading the web page, the user's last choice will be shown on the screen.

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