Config UI editing config.json
Hello, disclaimer: I'm a noob.

I've just installed this on a raspberry pi zero w using the wiki guide and seem to have things running (although I haven't added the accessory to Home App just yet). 
Using the homebridge-config-ui-x web page, I'm trying to modify the config.json file and it tells me there is a syntax error with what I've added, so I cannot save changes. I made the exact same edits to the config.json file directly with nano and the file is fine after a reload.
There's also an issue with the UI when using iOS to make changes. The screen cannot be scrolled up, so if you add lines the cursor disappears behind the on screen keyboard making it impossible to see what you've typed. I also cannot paste text into this editor window on iOS.
Cheers!
PerthSteve