Cookies Assertions - LambdaTest

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Cookie assertions let you verify browser cookies: check existence, values, and security attributes like httpOnly, secure, and sameSite.

How Capture Works

Cookies are captured as a point-in-time snapshot when the checkpoint triggers:

On-demand capture: Cookies are read from the browser context at the moment the assertion runs, not accumulated over time
Current state only: You see exactly what cookies exist right now, including any set by the page’s JavaScript or server responses
All cookies visible: Unlike document.cookie in JavaScript, KaneAI can see httpOnly cookies too
Domain-scoped: Cookies are captured for all domains the browser has visited in this session

Planning for Multi-Step Tests

Because cookies are captured at assertion time:

If you need to check cookies set by a specific page, assert on the same page or after you’ve visited it
If cookies are needed in a later step (e.g., after navigating away), extract and store them first
Cookies persist in the browser across steps (unlike network/console which reset), but asserting on a different domain may show different cookies

What You Can Query

Field	Type	Description
`name`	string	Cookie name (e.g., “session_id”)
`value`	string	Cookie value
`domain`	string	Domain (e.g., “.example.com”)
`path`	string	Cookie path (e.g., ”/“)
`expires`	float	Expiry as epoch seconds (-1 for session cookies)
`http_only`	bool	True if HttpOnly flag is set
`secure`	bool	True if Secure flag is set
`same_site`	string	”Strict”, “Lax”, or “None”

Example Assertions

Assert: a cookie named "session_id" exists
Assert: the session cookie is httpOnly
Assert: no cookies are set without the Secure flag
Assert: at least 3 cookies are set on the page
Assert: the auth cookie has sameSite set to "Strict"

Example Extractions

Store all cookies
Extract the value of the "session_id" cookie
Store all cookie names
Get all cookies for the example.com domain

Example If/Else

If a cookie named "auth_token" exists then go to dashboard, else go to login

​How Capture Works

​Planning for Multi-Step Tests

​What You Can Query

​Example Assertions

​Example Extractions

​Example If/Else