When I'm working in a javascript-heavy application I like to use Console.log() a lot for debugging. However, I want to ensure I've properly suppressed all console logging in production.

I'd like to create a python script to walk through a site and generate a list of pages that write something to the console. I know I could just have it rip through the javascript files before minimization and search for "Console.Log" but I'm often the analyst on a project and consequently don't have access to the codebase. We also have a ton of sites that haven't been touched in a while but could use a scan (great intern project :-) ).

Is this doable with python?

When I'm working in a javascript-heavy application I like to use Console.log() a lot for debugging. However, I want to ensure I've properly suppressed all console logging in production.

I'd like to create a python script to walk through a site and generate a list of pages that write something to the console. I know I could just have it rip through the javascript files before minimization and search for "Console.Log" but I'm often the analyst on a project and consequently don't have access to the codebase. We also have a ton of sites that haven't been touched in a while but could use a scan (great intern project :-) ).

Is this doable with python?

• javascript
• python

• You can use urllib to read the source looking for logs. – Malik Brahimi Commented Feb 23, 2015 at 16:52
• A sufficiently determined opponent could forever keep their console logging functionality from being detected. Ex. with eval(rot13(pbafbyr.ybt("Uryyb"))), just doing a search for "console" won't find it. The only way to be 100% sure that your program doesn't log, is to run all possible code paths with all possible inputs... But of course, most programs are not written by your arch-enemy, so just looking for "console.log" ought to catch 99% of cases. – Kevin Commented Feb 23, 2015 at 16:56
• doing something like console.log = console.warn = console.dir = console.debug = console.time = console.timeEnd = console.assert = function () {}; etc would supress all console logging – Paul S. Commented Feb 23, 2015 at 16:58
• Thanks @MalikBrahimi. I understand how I could find particular text or element in the page source with urllib but I don't understand how I would find console output? If the javascript has been minimized I can't just look for ".log()". – Elliott Commented Feb 23, 2015 at 17:03

1 Answer 1

What you can do is to use selenium browser automation tool and check the console logs:

from selenium import webdriver
from selenium.webdriver.mon.desired_capabilities import DesiredCapabilities    

capabilities = DesiredCapabilities.CHROME
capabilities['loggingPrefs'] = { 'browser':'ALL' }

driver = webdriver.Chrome(desired_capabilities=capabilities)

driver.get('http://foo.')

# print console log messages
for entry in driver.get_log('browser'):
    print entry

Taken from Getting console.log output from Chrome with Selenium Python API bindings.