I can't say I've seen that value anywhere in my travels with the API... And I don't see anything in the API docs either.
What is that value? What do you need it for?
Yes it is. It's for obtaining floor plans autonomously, however this approach requires a user to view source of a page it's not really a 'hidden Api'... hence my question.
I can't find any docs about that value being available via API. Make a wish!
Maybe this helps though, you might be able to reuse some of this code:
Seems like the following python function with settingval set to ng_id will get you the value.
def meraki_www_get_settings(strcontent, settingval, settingfull): ''' In the dashboard, there are a large number of settings hidden in the code. This function will parse and retrieve the value of a specific setting :param strcontent: String. Raw HTML of the page. :param settingval: String. If the setting is in the "Mkiconf.setting = " format, pass "setting" here. Otherwise... :param settingfull: String. If the setting is named or punctuated differently, pass the exact string here. :return: String. The value of the requested setting '''