Browser API
Cookies

0: Introduction
1: Setting cookies
2: Setting a cookie expiration date
3: Setting a cookie path
4: Setting a cookie domain
5: Cookies security
6: Updating a cookie
7: Deleting a cookie
8: Accessing the value of a cookie
9: ▶︎ Checking if a cookie exists
10: Inspecting cookies
11: Cookie not being set in Safari

[← back to the Valley]

Cookies: Checking if a cookie exists

Join the AI Workshop to learn more about AI and how it can be applied to web development. Next cohort February 1st, 2026

The AI-first Web Development BOOTCAMP cohort starts February 24th, 2026. 10 weeks of intensive training and hands-on projects.


Here’s how you can check if a cookie exists:

if (
  document.cookie.split(';').filter(item => {
    return item.includes('name=')
  }).length
) {
  //name exists
}
◀︎ Accessing the value of a cookie
▶︎ Inspecting cookies

Lessons in this unit:

0: Introduction
1: Setting cookies
2: Setting a cookie expiration date
3: Setting a cookie path
4: Setting a cookie domain
5: Cookies security
6: Updating a cookie
7: Deleting a cookie
8: Accessing the value of a cookie
9: ▶︎ Checking if a cookie exists
10: Inspecting cookies
11: Cookie not being set in Safari