Hi I currently try to generate a json schema from kotlin cla

Question

Hi I currently try to generate a json schema from kotlin classes and generating kotlin classes from json schema For my first part creating schema from kotlin classes I ran into and there I was pointed to kotlinx serialization at a very early stage see unfortunately this folder was completely removed in Now I cannot find any hint of similar classes or how I could achieve just that Is this still possible with kotlinx serialization If so how If not any other idea how I can achieve that

Nikky · Answer

<https github com Ricky12Awesome json schema serialization> does serializer gt schema i have a fork that does some adjustments to match my usecase but YES it is possible

Nikky · Answer

as for generating code from json schema i think i searched for that before but in the end json schema allows some combinations that are very hard to model using kotlin classes so i gave up on that

Nikky · Answer

i am not entirely sure what i did in the fork but i am using it in some projects to generate schemas for easier config writing intellij idea works very well vscode okayyish <https github com NikkyAI json schema serialization>

huehnerlady · Answer

< Nikky> Thank you for that I did stumble over the problem around kotlin generation from json schema too I now found and have a look further into it so far it is not 100 what I am looking for but I feel it gets in the right direction and has potential With the repositories you linked I ran into that one too The problem I had was the ton of annotations it seems to need for working I did not look at it in detail but from the example it looks like you do need annotation on everything for it to work So I dismissed that I found now to have good potential It is for java classes but so far it works for kotlin as well the nullable nonnullable is obviously not supported as java does not have that pattern but we have everything nullable at the moment anyways so it works So both of these together have a good potential although it is not exactly what I want yet and so need to look if a few tweaks might make it THE solution If someone has other ideas I would be happy to hear them slightly smiling face

Nikky · Answer

it works without the annotations but some things like descriptions and valid ranges for values it just won t be able to guess without the annotations it produces a perfectly working schema without it it can know what valid values are for enums represented as a string but it won t be able to guess a validation regex for a email

huehnerlady · Answer

Ah cool I will have a second look then thanks slightly smiling face

huehnerlady · Answer

< Nikky> I did try it now and unfortunately the schema and the enums are unfortunately inlined Maybe that is possible to prevent with annotations but seems not to work out of the box Kotlin ``` Serializable data class Foo val field1 String = null val field2 FooEnum = null val field3 FooEnum = null Serializable enum class FooEnum VALUE 1 VALUE 2 ``` ``` $schema type object properties field1 if type string else type null field2 if type string else type null enum VALUE 1 VALUE 2 field3 if type string else type null enum VALUE 1 VALUE 2 definitions ``` With definition it looks even worse as the names are auto generated ``` $schema $ref definitions x1a1q3f9pvqxof definitions x1a1q3f9pvqxof type object properties field1 $ref definitions x1oxo2fpbh9ren field2 enum VALUE 1 VALUE 2 $ref definitions x1u18olg46aewv field3 enum VALUE 1 VALUE 2 $ref definitions x1u18olg46aewv x1oxo2fpbh9ren if type string else type null x1u18olg46aewv if type string else type null enum VALUE 1 VALUE 2 ``` So I will continue with my current approach I think as at least I do not need any annotations for this

Nikky · Answer

i don t quite understand why annotations are a bad thing here these are marked for serialization to add them to the descriptors so it is compiled in and reflection is not necessary it also works on kotlinJs with a few small tweaks good luck with your approach

huehnerlady · Answer

Well it is about the readability and the amount of work you have to do in order to add fields We want to have this as small as possible and reflection per se is not a problem for us But thank you very much for the information slightly smiling face

Nikky · Answer

i find json schema is unreadable as it is even with descriptive names so i just need something working as output

Dariusz Kuc · Answer

have you looked at <https github com OpenAPITools openapi generator> you could generate just models pojos

huehnerlady · Answer

< Dariusz Kuc> thanks that was my first try but this is just for an openapi yaml and unfortunatelt the `paths` variable is mandatory in the spec so it seems not to be designed to use that just for a model so we had to discard that