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Showing content from https://playwright.dev/python/docs/auth below:

Authentication | Playwright Python

Playwright executes tests in isolated environments called browser contexts. This isolation model improves reproducibility and prevents cascading test failures. Tests can load existing authenticated state. This eliminates the need to authenticate in every test and speeds up test execution.

Regardless of the authentication strategy you choose, you are likely to store authenticated browser state on the file system.

We recommend to create playwright/.auth directory and add it to your .gitignore. Your authentication routine will produce authenticated browser state and save it to a file in this playwright/.auth directory. Later on, tests will reuse this state and start already authenticated.

danger

The browser state file may contain sensitive cookies and headers that could be used to impersonate you or your test account. We strongly discourage checking them into private or public repositories.

• Bash
• PowerShell
• Batch

mkdir -p playwright/.auth
echo $'\nplaywright/.auth' >> .gitignore

New-Item -ItemType Directory -Force -Path playwright\.auth
Add-Content -path .gitignore "`r`nplaywright/.auth"

md playwright\.auth
echo. >> .gitignore
echo "playwright/.auth" >> .gitignore

The Playwright API can automate interaction with a login form.

The following example logs into GitHub. Once these steps are executed, the browser context will be authenticated.

• Sync
• Async

page = context.new_page()
page.goto('https://github.com/login')


page.get_by_label("Username or email address").fill("username")
page.get_by_label("Password").fill("password")
page.get_by_role("button", name="Sign in").click()

page = await context.new_page()
await page.goto('https://github.com/login')


await page.get_by_label("Username or email address").fill("username")
await page.get_by_label("Password").fill("password")
await page.get_by_role("button", name="Sign in").click()

Redoing login for every test can slow down test execution. To mitigate that, reuse existing authentication state instead.

Playwright provides a way to reuse the signed-in state in the tests. That way you can log in only once and then skip the log in step for all of the tests.

Web apps use cookie-based or token-based authentication, where authenticated state is stored as cookies, in local storage or in IndexedDB. Playwright provides browser_context.storage_state() method that can be used to retrieve storage state from authenticated contexts and then create new contexts with prepopulated state.

Cookies, local storage and IndexedDB state can be used across different browsers. They depend on your application's authentication model which may require some combination of cookies, local storage or IndexedDB.

The following code snippet retrieves state from an authenticated context and creates a new context with that state.

• Sync
• Async

storage = context.storage_state(path="state.json")


context = browser.new_context(storage_state="state.json")

storage = await context.storage_state(path="state.json")


context = await browser.new_context(storage_state="state.json")

Reusing authenticated state covers cookies, local storage and IndexedDB based authentication. Rarely, session storage is used for storing information associated with the signed-in state. Session storage is specific to a particular domain and is not persisted across page loads. Playwright does not provide API to persist session storage, but the following snippet can be used to save/load session storage.

• Sync
• Async

import os

session_storage = page.evaluate("() => JSON.stringify(sessionStorage)")
os.environ["SESSION_STORAGE"] = session_storage


session_storage = os.environ["SESSION_STORAGE"]
context.add_init_script("""(storage => {
  if (window.location.hostname === 'example.com') {
    const entries = JSON.parse(storage)
    for (const [key, value] of Object.entries(entries)) {
      window.sessionStorage.setItem(key, value)
    }
  }
})('""" + session_storage + "')")

import os

session_storage = await page.evaluate("() => JSON.stringify(sessionStorage)")
os.environ["SESSION_STORAGE"] = session_storage


session_storage = os.environ["SESSION_STORAGE"]
await context.add_init_script("""(storage => {
  if (window.location.hostname === 'example.com') {
    const entries = JSON.parse(storage)
    for (const [key, value] of Object.entries(entries)) {
      window.sessionStorage.setItem(key, value)
    }
  }
})('""" + session_storage + "')")

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