The Ahhhha light will go on, when loading up that URL in a common browser.
Here is one file that is at that location:
Bulb on? . . .
List of officially supported Authentic Espruino Boards
Function Language Reference
my IDE has the default setting "http://www.espruino.com/json". What's the purpose of it?
I build my own firmware with graphics, telnet and ota removed, and didn't run into any issues. Shall I provide my own BOARD.json file, and what's the purpose of this setting, generally?