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How browser automation establishes an authenticated session
A browser becomes authenticated when the application recognizes state associated with a successful login. A typical UI login may involve a redirect chain, with cookies set during redirects before the application reaches its signed-in page. Do not treat a successful click as proof that authentication is complete: wait for a stable final URL or assert an element that only appears after sign-in, then save the state.
Playwright’s Authentication guide demonstrates this pattern and describes reusing the resulting state. Use the UI path when the test needs to cover login behavior; reuse a saved state when login itself is not what the test is verifying.
How to log in once and reuse state in Playwright
1. Create a setup project that performs the real login
In a Playwright configuration, define a setup project and make the browser tests depend on it. The setup test should open the login page, fill the actual form, submit it, and wait for an authenticated condition before writing state. The exact selectors, credentials, and final URL are application-specific; use test credentials stored outside source control rather than hard-coding them.
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import { test as setup, expect } from '@playwright/test';
setup('authenticate', async ({ page }) => {
await page.goto('https://app.example.com/login');
await page.getByLabel('Email').fill(process.env.TEST_EMAIL!);
await page.getByLabel('Password').fill(process.env.TEST_PASSWORD!);
await page.getByRole('button', { name: 'Sign in' }).click();
// Wait for a post-login condition, not merely the click.
await expect(page).toHaveURL(/dashboard/);
await expect(page.getByRole('navigation', { name: 'Account' })).toBeVisible();
await page.context().storageState({ path: 'playwright/.auth/user.json' });
});Ensure the destination directory exists before the test runs. Configure the setup project to run before dependent browser projects; the official guide documents the project dependency and storage-state configuration for this pattern.
2. Load state into test contexts
Set storageState to the generated file in the relevant project or when creating a context. Each test can then start in the signed-in state without replaying the login flow. Keep tests that specifically verify sign-in on a fresh state or separate project so saved authentication does not bypass the behavior under test.
Rank #2
import { defineConfig } from '@playwright/test';
export default defineConfig({
projects: [
{ name: 'setup', testMatch: /.setup.ts/ },
{
name: 'chromium',
dependencies: ['setup'],
use: { storageState: 'playwright/.auth/user.json' }
}
]
});This is a configuration sketch: adapt project names and file paths to your test suite. Playwright’s documentation covers the full setup-project workflow.
Cookies, local storage, IndexedDB, and sessionStorage
These storage mechanisms are not interchangeable. Playwright storage state can include cookies, local storage, IndexedDB, and passkey-related state. Session storage is the exception: Playwright does not provide a built-in storage-state option to persist it. If the application depends on sessionStorage, add explicit application-specific save and restore code; do not expect the ordinary storage-state file to contain it.
| Mechanism | Persistence in Playwright storage state | Practical implication |
|---|---|---|
| Cookies | Supported | Commonly carry session identifiers; protect state files accordingly. |
| Local storage | Supported | Restored with the saved state for the applicable origin. |
| IndexedDB | Supported | Can be included when the application stores authentication-related data there. |
| Passkey-related state | Supported | Available as part of Playwright’s documented storage-state capabilities. |
| Session storage | Not included by the built-in storage-state API | Requires custom save/load handling if the app relies on it. |
See the official storage-state documentation for the supported state types and its sessionStorage example. Avoid custom persistence unless the app’s behavior actually requires it.
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When to reuse state and when to log in through the UI
| Approach | Best fit | Trade-off |
|---|---|---|
| UI login for each relevant test | Tests whose purpose includes login, redirects, or sign-in interface behavior | Exercises the real flow, but repeats setup work. |
| Setup login plus saved state | Tests focused on signed-in features rather than authentication | Avoids repeating login, but depends on valid, unexpired state. |
Use both where appropriate: a small set of tests can exercise login directly, while tests of authenticated product features use saved state. When a session expires or the application changes its authentication behavior, rerun setup to refresh the file.
Keep tests isolated and protect credentials
Keep state files out of source control
Playwright warns that authentication state can contain cookies and headers capable of impersonating an account: “We strongly discourage checking them into private or public repositories.” Store state in a dedicated ignored directory such as playwright/.auth, restrict who and what can read it, and do not print its contents in logs or failure artifacts.
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A shared account can be practical when concurrent tests do not interfere with one another. If tests mutate shared server-side data, parallel runs can race or invalidate each other’s assumptions; use separate accounts for those tests. Also check whether the app’s authentication behavior is browser-specific before assuming one saved state will work identically across browser engines.
Rank #4
Use independent browser contexts
Browser contexts provide independent sessions, which lets tests avoid sharing browser-side cookies and related state. Playwright’s BrowserContext API reference documents context-level cookie management and HTTP authentication credentials. Configure HTTP credentials through the context API when the site uses HTTP authentication, and scope credentials to the intended origin where possible.
HTTP authentication is separate from an app login
Some sites prompt for HTTP authentication before serving the application. That is distinct from submitting a username and password through the site’s login form. Playwright exposes HTTP credentials as a browser-context option, including origin scoping; use that mechanism for HTTP authentication rather than confusing it with application cookies or UI login state. Consult the BrowserContext reference for the current API details.
Security context for OAuth-based browser applications
The IETF published RFC 10017, “OAuth 2.0 for Browser-Based Applications,” as a Best Current Practice in August 2026. It addresses threats, consequences, security considerations, and best practices for browser-based applications using OAuth 2.0. This guidance is relevant when designing the application’s authentication architecture; a browser test’s saved state is not a substitute for those design decisions.
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Troubleshooting authentication tests
- The test continues as signed out after clicking Sign in: The click may have started a redirect chain that has not completed. Wait for the final authenticated URL or assert a post-login UI element before saving state.
- A test cannot find the state file: Confirm the setup project ran before the dependent project and that the configured output path matches the path passed to
storageState. - State restores cookies but the app still requires login: Check whether the app also relies on local storage, IndexedDB, passkey-related state, or sessionStorage. The last of these needs custom persistence.
- The saved session no longer works: The session may have expired or been invalidated. Rerun the setup login and refresh the ignored state file.
- Parallel tests interfere with each other: Determine whether they share server-side account data. Allocate separate accounts when tests mutate shared state.
- Authentication works in one browser but not another: Confirm that the application supports the same authentication state across the browser engines you test; browser-specific behavior can matter.
- The site shows an HTTP authentication prompt: Configure context-level HTTP credentials instead of relying on the app’s form-login flow.
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Frequently Asked Questions
Does Playwright storageState save sessionStorage?
No. Session storage requires custom save and restore handling if an application depends on it.
Can I use one saved login state for every browser?
Not necessarily. The application’s authentication design may impose browser-specific requirements.
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Is an authenticated state file safe to commit to a private repository?
Playwright strongly discourages committing it to private or public repositories because it may contain cookies and headers that can impersonate an account.
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