set_local_storage_item error in UC mode and doesn't work in CDP mode

[Valleymu]

Hi, I need to set value in localStorage, I'm using CDP mode

with SB(
        uc=True,
        incognito=True,
        locale_code="en",
        extension_dir='extension/buster',
        headed=True,
        xvfb=False,
        window_size="1920,1080",
        window_position="0,0",
        maximize=True
) as sb:
    sb.activate_cdp_mode("https://discord.com/login")
    sb.sleep(3)
    token = "XXX"
    sb.cdp.set_local_storage_item("token", f'"{token}"')
    sb.cdp.refresh()
    sb.sleep(1990)

But after sb.cdp.refresh() is called token is being cleared (it's same when I manually add item and refresh cdp page)

So I've tried with UC mode:

with SB(
        uc=True,
        incognito=True,
        locale_code="en",
        extension_dir='extension/buster',
        headed=True,
        xvfb=False,
        window_size="1920,1080",
        window_position="0,0",
        maximize=True
) as sb:
    sb.uc_open_with_reconnect("https://discord.com/login")
    sb.sleep(3)
    token = "XXX"
    sb.set_local_storage_item("token", f'"{token}"')
    sb.refresh()
    sb.sleep(1990)

But it fails with:

Traceback (most recent call last):
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\test.py", line 29, in <module>
    sb.set_local_storage_item("token", f'"{token}"')
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\venv\lib\site-packages\seleniumbase\fixtures\base_case.py", line 8903, in set_local_storage_item
    self.execute_script(
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\venv\lib\site-packages\seleniumbase\fixtures\base_case.py", line 3423, in execute_script
    return self.driver.execute_script(script, *args, **kwargs)
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 444, in execute_script
    return self.execute(command, {"script": script, "args": converted_args})["value"]
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 384, in execute
    self.error_handler.check_response(response)
  File "C:\Users\Admin\PycharmProjects\autovoter2-t\venv\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 232, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.JavascriptException: Message: javascript error: Cannot read properties of undefined (reading 'setItem')
  (Session info: chrome=138.0.7204.100)

When I manually run :

localStorage.setItem("test", "test")

in console it works only when I change JS context from "top" to "DevTools Performance Metrics"

[SSujitX]

Hi, I need to set value in localStorage, I'm using CDP mode

Incognito mode doesn't support extensions.

Did you check sb.cdp.reload(ignore_cache=True, script_to_evaluate_on_load=None)?

[Valleymu]

Actually looks lke setting localStorage item using cdp on discord login page doesn't have any result. There's no item created:

with SB(
        uc=True,
        locale_code="en",
        headed=True,
        xvfb=False,
        window_size="1920,1080",
        window_position="0,0",
        maximize=True
) as sb:
    sb.activate_cdp_mode("https://discord.com/login")
    sb.sleep(3)
    token = "XXX"
    sb.cdp.set_local_storage_item("token", f'"{token}"')
    sb.sleep(1990)

[OnlineProxy-io]

When you're rollin' in CDP mode, localStorage tends to get wiped after a refresh()-that’s usually 'cause the JavaScript context resets or it kicks off a fresh browsing session. If you wanna keep your data around, the move is to reapply set_local_storage_item() after the page loads and the DOM's good to go. Timing here is everything-run it too early and boom, you’re staring at undefined errors, especially in UC mode where context isolation is way more strict. Now, on sites like Discord, it gets even trickier. If that sounds like a hassle, you’ve got a few backup plays-like injecting scripts once the page's fully loaded, restoring session cookies, or ditching the whole setup for something smoother like Puppeteer.

[Valleymu]

Actually problem was that discord remove reference to localStorage https://stackoverflow.com/questions/52509440/discord-window-localstorage-is-undefined-how-to-get-access-to-the-localstorage