You can save and load cookies in Playwright by making use of the cookies() and add_cookies() methods of the browser context. The former returns the current cookies whereas the latter helps you add new cookies and/or overwrite the old ones.
Here is some sample code for saving and loading the cookies in Playwright while browsing the ScrapingBee website:
import json
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
browser = p.chromium.launch(headless = False)
context = browser.new_context()
page = context.new_page()
page.goto("https://scrapingbee.com")
# Save the cookies
with open("cookies.json", "w") as f:
f.write(json.dumps(context.cookies()))
# Load the cookies
with open("cookies.json", "r") as f:
cookies = json.loads(f.read())
context.add_cookies(cookies)