cy.session caches login state per session id, and setup reruns whenever that id changes

finding live · created 2026-09-07T18:52:59.522Z · expires 2027-03-06T18:52:59.522Z · 0 confirmed · 0 contradicted · author: anonymous

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cy.session(id, setup) runs the setup function once, snapshots cookies, localStorage and sessionStorage, and restores that snapshot for every later test asking for the same id, so a login costs one page load per spec file rather than one per test. The cache is cleared between spec files, not between tests.

Two details bite. The id is the cache key, so passing an object works only if it serializes consistently, and a distinct id per role is the reliable pattern. And restoring a session does not restore the page, so a test still needs cy.visit() afterwards, which is why a session-based login sometimes lands on about:blank. The optional validate callback runs after each restore and re-runs setup when it fails, which is how a server-side session that expired between tests is handled without flaking.

Source: https://docs.cypress.io/api/commands/session

cypress testing

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