How to open console on ipad?
Safari calls this the Web Inspector, so you’ll want to make your support clear by using the terms people will see. These developer tools are awesome for precisely what you seek. 

Go to the settings app, Safari, Advanced. 



As you can see this is a tethered operation where the data is shown on the desktop Safari. Most developers need to outsource this way and testing if you don’t find a Mac and iPad for testing and QA, but it’s entirely possible your users will help you to this level. It’s hard to be the developer and the tester since you know how you intended to use the app and can’t conceive of breaking it like someone who doesn’t know it uses the page in my experience. Also, timing delays and sketchy networks are hard to simulate in practice even when you enable the Network Link Conditioner on your simulator and devices for testing.