qmk-firmware/docs/configurator_troubleshooting.md

Configurator Troubleshooting

My .json file is not working

If the .json file was generated with QMK Configurator, congratulations you have stumbled upon a bug. File an issue at qmk_configurator

If not....how did you miss my big bold message at the top saying not to use other .json files?

There are extra spaces in my layout? What do I do?

If you're referring to having three spots for space bar, the best course of action is to just fill them all with space bar. The same can be done for backspace and shifts

What is the keycode for.......

Please see:

• Basic Keycode Reference
• Advanced Keycode Reference

It won't compile

Please double check the other layers of your keymap to make sure there are no random keys present.