playwright
Browser automation library for Python — controls Chromium, Firefox, and WebKit browsers programmatically. playwright features: sync and async APIs, auto-wait for elements (no explicit sleeps needed), page.goto()/click()/fill()/type()/select(), locators API (page.locator('css') with get_by_text/role/label/placeholder), network interception (page.route()), screenshots/video recording, tracing for debugging, PDF generation, multi-tab/multi-page, context isolation, device emulation, geolocation, permissions, and chromium-specific APIs. Significantly more reliable than Selenium due to auto-wait and modern architecture.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Browser automation. Do not log passwords filled into forms. Browser storage state contains session tokens — protect file. Headless browsers can be fingerprinted. page.route() can intercept HTTPS — only use for testing own applications. Sandboxing: run in Docker or VM for untrusted pages.
⚡ Reliability
Best When
Browser automation, end-to-end testing, and scraping JavaScript-heavy websites — playwright's auto-wait and reliable locators make it the best choice for modern web automation.
Avoid When
Static HTML scraping (use requests/BS4), mobile apps, high-volume scraping at scale, or when a simpler HTTP client suffices.
Use Cases
- • Agent web automation — from playwright.sync_api import sync_playwright; with sync_playwright() as p: browser = p.chromium.launch(headless=True); page = browser.new_page(); page.goto(url); page.get_by_role('button', name='Submit').click(); result = page.locator('.result').text_content(); browser.close() — sync automation; agent navigates and interacts with web pages
- • Agent async scraping — async with async_playwright() as p: browser = await p.chromium.launch(); page = await browser.new_page(); await page.goto(url); items = await page.locator('.item').all_text_contents(); await browser.close() — async scraping; agent extracts structured data from dynamic JavaScript-rendered pages
- • Agent form filling — page.get_by_label('Email').fill('user@example.com'); page.get_by_label('Password').fill(password); page.get_by_role('button', name='Login').click(); page.wait_for_url('**/dashboard') — form interaction; agent fills and submits forms; wait_for_url confirms navigation completed
- • Agent network mocking — page.route('**/api/data', lambda route: route.fulfill(json={'items': mock_data})); page.goto(app_url) — network intercept; agent intercepts and mocks API calls during testing; route.continue_() to pass through; route.abort() to simulate network failure; useful for agent testing with controlled responses
- • Agent screenshot and PDF — page.screenshot(path='screenshot.png', full_page=True); page.pdf(path='output.pdf', format='A4') — capture; agent captures full-page screenshots or generates PDFs from web pages; useful for reporting, archiving, and visual verification
Not For
- • Simple HTTP scraping — playwright launches full browser (100MB+); for HTML scraping without JS, use requests + BeautifulSoup or httpx
- • Mobile app automation — playwright controls browsers only; for iOS/Android apps use Appium
- • High-volume scraping — each browser instance is heavyweight; for scale use request-based scrapers with playwright only for JS-required pages
Interface
Authentication
No auth for the library. Browser context supports cookies, storage state, and HTTP auth for target websites.
Pricing
playwright is Apache 2.0 licensed. Browsers bundled via playwright install. Free for all use.
Agent Metadata
Known Gotchas
- ⚠ playwright install required after pip install — pip install playwright does NOT install browsers; must run: playwright install chromium (or firefox, webkit, --with-deps); agent setup: include playwright install in CI; playwright install --with-deps for system dependencies on Linux; browsers installed to ~/.cache/ms-playwright/
- ⚠ Locators are lazy — page.locator('.selector') does not search immediately; action (click/fill/text_content) triggers the search with auto-wait; agent code: prefer locator().click() over find_element equivalent; chaining: page.locator('.container').locator('.item').first.text_content() — searches within container
- ⚠ Auto-wait has default 30s timeout — all locator actions wait up to 30s for element to appear and be actionable; TimeoutError if not found; agent code: set page.set_default_timeout(5000) for faster failures; set timeout per-action: locator.click(timeout=5000); do NOT add manual time.sleep() — defeats auto-wait
- ⚠ Browser context vs page — browser.new_context() creates isolated context (cookies, storage, auth); browser.new_page() creates page in default context; agent code needing isolation between tasks: create separate contexts; share context for multi-tab within same session; context.storage_state() saves session for reuse
- ⚠ Sync API cannot be used in async context — sync_playwright() blocks; cannot call from asyncio event loop; agent code in async framework: use async_playwright(); async with async_playwright() as p:; await all operations; mixing sync and async playwright causes errors
- ⚠ page.route() intercept must call route.fulfill/continue/abort — page.route(pattern, handler) intercepts matching requests; handler must call route.fulfill(), route.continue_(), or route.abort() or request hangs forever; agent code: every route handler must handle every matched request; use route.continue_() as default passthrough
Alternatives
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Scores are editorial opinions as of 2026-03-06.