JavaScript Cookies. In this tutorial you will learn how to create, read, update and delete a cookie in JavaScript. What is a Cookie. A cookie is a small text file that lets you store a small amount of data (nearly 4KB) on the user's computer.

Get Cookie Reading a cookie is just as simple as writing one because of the value of the document.cookie object is the cookie. So, you can use this string whenever you want to access the cookie.

JavaScript Cookie Example. ... The function sets a cookie by adding together the cookiename, the cookie value, and the expires string. A Function to Get a Cookie.