Simple JSON layout creator (spreadsheet).

[Symbiomatrix]

I've made a quick & dirty layout creator in libreoffice (plus excel and google sheets, links below), not sure if anyone's made something more fancy in js or whatnot.
It currently supports multiple rows of keys, each with a single optional popup (which can be easily expanded to multiple popups, I'm just minimalistic with my layouts).
(17/09/24 update) All sheets now also support shift mode keys - currently only the manual / lock shift modes, without popups, and must have both manual and lock which is by default set to copy from manual. It's all possible to customise but more boilerplate and I don't have much use for it.
I use shift modes in languages or keys which don't have natural shift, to extend the keys list without having to swap keyboards - for example, add english to languages which don't use the latin alphabet, katakana mode when hiragana's the default, and mimicking pc of 1->!, 2->@ etc are all valid options.
@Helium314 I've had gepetto write a simple standalone js visualiser for the json layouts the sheets can create, that approach might be more reliable & moddable than having people post screenshots of the layout, albeit not as refined currently.

https://github.com/Symbiomatrix/SpreadsheetTricks/blob/main/KeyboardHeliFormatterS.ods

Edit: Also added xlsx version, haven't tested it.
https://github.com/Symbiomatrix/SpreadsheetTricks/blob/main/KeyboardHeliFormatterS.xlsx

Edit2: And here's an online version via google sheets. It works correctly on windows, but on my android it adds double quotes and doesn't add newlines (maybe should switch to char(10) for that).
https://docs.google.com/spreadsheets/d/1CVgmcZkYNL6Pbw9cGyKEtvdPTA3oCexV4ksJHAtS-SE/edit?usp=sharing

Edit3: Simple js keyboard visualiser uploaded as well, see example below.

https://github.com/Symbiomatrix/SpreadsheetTricks/blob/main/KeyboardHeliVisualiserS.html

[Helium314]

Thanks!
I haven't tested it yet (don't even have Libre Office installed), but this should be really useful.

Now ideally there would be a place for easy layout sharing...

[Symbiomatrix]

You're not alone, libre's definitely an acquired taste; that's why I've also uploaded xlsx and google sheets versions, they should be fine besides being more fussy with newlines.

Perhaps. Frankly, I'm more of a DIY type of guy when possible, and the available ones were sufficient to get the hang of the advanced layout format, but indubitably many prefer prebuilts.