Playwright’s Electron integration exposes a BrowserContext, but that does not make Electron cookies behave like cookies in a regular Playwright browser. Playwright’s documentation says cookie retrieval returns null for contexts created outside a normal browser, including Electron; Electron’s own cookies belong to an Electron Session. A logout can also come from authentication data stored outside cookies or from cookies that do not survive an app restart.
Why Playwright cookie calls do not map cleanly to Electron
Playwright’s ElectronApplication API provides access to the app’s BrowserContext through electronApplication.context(). However, Playwright’s BrowserContext documentation explicitly notes that cookie retrieval returns null for contexts created outside a normal browser, including Electron. Do not assume the usual browser-context cookie workflow can inspect or control Electron’s cookie store.
Electron manages cookies through a Session. Its Cookies API provides operations to get, set, remove, and flush cookies for that session. The important match is the session used by the BrowserWindow making the request—not merely whichever context object is easiest to reach.
A developer reported context.cookies() failing with Protocol error (Storage.getCookies): Browser context management is not supported. in Playwright issue #12096, opened on February 14, 2022. That is evidence of a failure reported with Electron, not proof that every cookie operation fails on every current version.
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First identify when the logout happens
Record the exact Playwright and Electron versions before diagnosing the behavior. Playwright describes its Electron automation support as experimental, and both projects’ APIs can change.
| When the app appears signed out | What to investigate first |
|---|---|
| During the same run, after a navigation, or after opening another window | Whether the request and the window use the same Electron Session, and whether the cookie’s URL, domain, path, security, and SameSite scope match the request. |
| After the test closes or tears down its context | Whether the test discarded or replaced state, and whether the app relies on storage beyond cookies. |
| Only after closing and relaunching the app | Whether the cookie is persistent or a session cookie, whether it was written to disk, and whether the relaunch uses the same session partition. |
Use the Electron Session for Electron cookies
From the main process, identify the Session associated with the relevant window or app partition, then use that session’s cookies API. Electron documents cookie operations as Session-level operations available from the main process.
- Check session identity: A window using a custom partition may not share the default session. Inspect the session configured for the window that makes the authenticated request.
- Check cookie scope: Confirm the request URL matches the cookie’s domain and path, and review its
secureand SameSite attributes. - Await writes: Wait for the promise returned by
cookies.set()before continuing the test or making a request that depends on the cookie. - Check persistence: Electron treats a cookie set without
expirationDateas a session cookie, which is not retained between sessions. Electron also says cookie writes may be stored periodically; callflushStore()when unwritten data must be written to disk immediately.
Check whether authentication lives outside cookies
A successful cookie read does not prove that the app’s full login state is present. Playwright’s authentication guide describes authentication state held in cookies, localStorage, IndexedDB, or passkeys. The app’s own authentication design determines which store matters.
- localStorage or IndexedDB: Cookie-only inspection misses state kept in either store. Playwright’s storage-state workflow covers cookies and localStorage, with support for capturing IndexedDB in current versions when requested.
- sessionStorage: Playwright says its storage-state workflow does not persist sessionStorage automatically. A test that depends on it needs app-specific save-and-restore logic.
- WebAuthn or passkeys: Authentication may depend on credentials rather than a cookie alone, so inspect the application’s actual sign-in flow.
Playwright’s storageState is intended for documented browser-context authentication workflows; it is not a drop-in serialization mechanism for Electron’s Session cookie store. Use Electron’s Session API for Electron cookies and handle any other authentication stores according to how the app uses them.
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- Capture the conditions: Note exact Playwright and Electron versions, which window is affected, and whether sign-out follows navigation, test teardown, or a full app restart.
- Find the authentication store: Establish whether the app uses Electron-session cookies, localStorage, IndexedDB, sessionStorage, passkeys, or a combination.
- Match the session: Trace the affected window to its Electron
Sessionand partition. Perform cookie inspection or mutation through that session’scookiesAPI. - Validate the cookie: Check its URL/domain/path scope,
secureand SameSite settings, and expiration. Await writes before relying on them. - Test persistence separately: If sign-out occurs only after relaunch, determine whether the cookie has an expiration date and whether pending writes need
flushStore(). - Handle other stores explicitly: If authentication uses sessionStorage or another non-cookie store, make the test preserve or recreate that state rather than treating a cookie snapshot as complete.
What the logout does—and does not—tell you
A logout after Playwright interacts with cookies does not, by itself, establish a Playwright bug. The symptom can arise because the Electron window uses a different Session, the cookie does not match the request or persist across restarts, or authentication depends on state outside cookies. The available evidence does not establish one universal root cause or quantify how often this happens; the timing and the app’s storage design are what narrow it down.
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