RealmGenerator is a wbsite you can find under http://realmgenerator.eu, check http://realmgenerator.eu/about.html for more info.

You can also generate model files directly from command line. Example:

$ php processor-cli.php Android model.json 

./data/realm_model585274f772158/

You will get the name of the directory containing the generated files.

The main algorithm which does the conversion is written in PHP. Normally I'm an Android developer and I made this generataor becase I needed it. As I'm not an expert in PHP, there are probably many places where the code can be improved. I will be grateful for any feedback:).

I'm planning to add Objectiv C and React Native too.