Can anyone who gets this try and check in the Chrome debug log and see if there are any messages in the console that might shed light on what the 'Invalid JSON' actually was?
Unfortuneatly I get it only in Gadgetbridge (in my case - but it turns the app installer useless) but not on Chromium on Linux - so I cannot take a look at the console.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Can anyone who gets this try and check in the Chrome debug log and see if there are any messages in the console that might shed light on what the 'Invalid JSON' actually was?