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For independent Playwright runs, create a fresh BrowserContext for each test or session, create its pages inside that context, and close it when the work is done. A context isolates browser-side state such as cookies and web storage. It does not isolate shared accounts, database records, files, or other server-side resources; parallel runs need a plan for those too.
What a Playwright browser context isolates
Playwright describes its test environments this way: “Tests written with Playwright execute in isolated clean-slate environments called browser contexts.” Playwright documentation on isolation explains that these contexts provide independent browser sessions. Cookies and web storage belong to the context, so a new context starts without another context’s browser state unless you deliberately seed it.
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Pages and popups created in a context belong to that same session. Use multiple pages in one context when they should share an identity—for example, when a task opens a popup while remaining logged in on the original page. Use separate contexts when sessions must be independent. Playwright’s BrowserContext API reference documents the context lifecycle and methods.
Create and close a fresh context
Playwright Test creates an isolated context for each test by default. If you are automating directly through the browser API, create one explicitly. This runnable Node.js example uses the Chromium browser type; install the Playwright package and its browser beforehand, then run it with Node.js:
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const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
try {
const context = await browser.newContext();
try {
const page = await context.newPage();
await page.goto('https://example.com');
console.log(await page.title());
} finally {
await context.close();
}
} finally {
await browser.close();
}
})();For a second independent session, create a second context with browser.newContext() and create its pages from that context. Do not reuse a page or context when the new run is meant to begin clean. Non-persistent contexts do not write browsing data to disk; closing the context ends its browser-side session.
Share login state deliberately
If authenticating for every test is costly, authenticate in a setup step, save the required storage state, then initialize a new context with that snapshot. That is an intentional transfer of authentication state, not a reason to make tests rely on another test’s live context. Playwright’s authentication guide covers saving and reusing storage state.
Check which mechanisms your application uses. Playwright storage state supports cookies and local storage, and its documentation describes options for IndexedDB and WebAuthn credentials. It does not provide a direct API to persist session storage. If your application relies on session storage, save and restore it explicitly with an initialization script or application-specific setup; do not assume a storage-state file includes it.
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Make parallel runs independent beyond the browser
Separate contexts prevent browser-side state carryover, but they do not prevent two tests from changing the same server-side data. Before running tests concurrently, give them distinct or worker-scoped resources where needed:
- Use unique record identifiers or separate worker accounts when tests modify shared backend records.
- Write screenshots, downloads, reports, and other artifacts to unique per-test paths.
- Avoid module-level mutable state and test-order dependencies.
- Consider external services and shared fixtures, not just the browser and database.
Playwright’s parallelism documentation discusses parallel execution. The appropriate account and fixture strategy depends on what each test changes; a new context alone cannot make shared application data safe.
When to use a persistent browser profile
A persistent context uses a user-data directory to preserve profile data across runs. It is useful when continuity on disk is a requirement, rather than when you simply need an isolated test session. A persistent launch provides the only context for that browser instance, and concurrent browser instances must not share the same user-data directory.
Playwright warns that automating Chrome’s default user profile is unsupported. Create a separate directory for automation instead. See the BrowserType API reference for persistent-context behavior and launch options.
| Choice | State behavior | Use it when | Important consideration |
|---|---|---|---|
| Fresh non-persistent context | Independent browser-side state; does not write browsing data to disk | Each test or run should start clean | Server-side records and files still need their own isolation |
| New context seeded with storage state | Starts as a separate context with selected saved authentication state | Login setup should be reused intentionally | Saved state is sensitive, and session storage needs separate handling if used |
| Persistent context | Uses a user-data directory for disk-backed continuity | A run needs a persistent profile | Do not share the directory between concurrent browser instances; use a dedicated automation profile |
Keep tests and visual captures reliable
Isolation removes one source of flaky behavior, but it is not the whole reliability strategy. For visual comparisons, Playwright recommends keeping operating-system and browser versions consistent. Use resilient, user-facing locators; Playwright locators auto-wait and retry relevant actionability checks. Its Best Practices guide explains these recommendations. The cited Playwright documentation does not establish a numerical speed, memory, or failure-rate advantage for one isolation strategy, so do not treat context choice as a benchmark claim.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common isolation problems
A test sees another run’s login or cookies
Check whether the runs are accidentally sharing the same context, page, or persistent profile. Give each independent run a fresh context. If you load storage state, confirm that the transfer is deliberate and that you are not reusing a live session unintentionally.
A context is clean, but tests still overwrite each other
Look beyond browser storage. Check shared account credentials, database records, server-side fixtures, downloads, and output filenames. Use distinct or worker-scoped resources for anything concurrently modified.
A restored login is missing or incomplete
Verify which browser storage mechanism the application uses. Storage state does not directly persist session storage; add application-specific save-and-restore logic if required. If authentication uses IndexedDB or WebAuthn credentials, consult the authentication guide’s documented support and options for the installed Playwright version.
A persistent launch fails or behaves unexpectedly in parallel
Ensure each concurrent browser instance has its own user-data directory. Do not automate Chrome’s default user profile; create a separate profile directory for automation.
Visual results differ between runs
Keep the operating system and browser versions consistent, and prefer resilient, user-facing locators for interactions. Differences in the environment can undermine visual comparisons even when browser contexts are isolated.
Or skip the browser setup
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For a quick command-line capture, replace the target URL and API key:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for response details and options. Sign up for 1,000 free screenshots a month, with no card required.
Check the installed Playwright version
Playwright documentation is updated over time. API annotations and recommendations can change, so check the documentation that matches your installed version when implementing storage-state or persistent-profile behavior. The links above are official Playwright documentation and API references.
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