Hi guys I was wondering if there exist something for JSON pa

Question

Hi guys I was wondering if there exist something for JSON parsing that work with Retrofit in android like Codable Protocol in ios Swift that allow dynamic json parsing or I should create my own JSON converter for every type

Casey Brooks · Answer

There s a Retrofit converter adapter for kotlinx serialization <https github com JakeWharton retrofit2 kotlinx serialization converter>

Mohammed Alaa · Answer

Thanks will try it

Anastasia Finogenova · Answer

Gson and it has a converter factory for retrofit

Cody Engel · Answer

Moshi has been nice you forget there s even JSON serialization happening

varun · Answer

I also prefer Moshi over Gson because Moshi gives an exception when you try to parse null absent values into fields that are non nullable Gson silently sets those non nullable fields to null via reflection and then you get an exception where you won t expect it

Mohammed Alaa · Answer

Yes I had tried Converter factory but this will reqire me to know all the keys which valus are changing lets say for example I have a key which return sometimes JsonArray and other times return JsonObject in the same API Call so I need to know this key

varun · Answer

< Mohammed Alaa> Can you post samples of the type of responses you are expecting

Mohammed Alaa · Answer

< varun> of course

Cody Engel · Answer

Oh gotcha So as other countries are added you ll get a new key and value but the root object would stay the same

Mohammed Alaa · Answer

< Cody Engel> yes

Anastasia Finogenova · Answer

I had the same issue that the same key could be either an array or an object and successfully fixed it with Gson

Anastasia Finogenova · Answer

Also if you are using kotlin and null is set to non nullable value the app will crash

Anastasia Finogenova · Answer

Anastasia Finogenova · Answer

Pretty common case it seems shrug

Mohammed Alaa · Answer

< Anastasia Finogenova> Thanks this is very interesting

Mohammed Alaa · Answer

< Anastasia Finogenova> +1 Solution with Generic are good for me so I can t know how many keys will need this

Cody Engel · Answer

This shouldn t be a common use case but yeah it happens Moshi lets you write custom converters as well

Anastasia Finogenova · Answer

Common in a way it doesn t surprise me at all sweat smile

Mohammed Alaa · Answer

< Cody Engel> yes it isn t a common use case but it happened with me smiley

Anastasia Finogenova · Answer

Happened to me too and appearantly if the answer on stackoverflow has 74 upvotes at least to other 74 people laughing

Mohammed Alaa · Answer

Yes You count only who up vote so whats about others who doesn t vote and happened with them wink

Anastasia Finogenova · Answer

Exactly some bad backend designers out there shrug

Cody Engel · Answer

For sure don t want to say it doesn t happen regularly with various APIs just saying that it shouldn t because an array and map aren t the same type joy

Cody Engel · Answer

But with Moshi you can create custom adapters with the ` FromJson` annotation probably similar to other JSON serialization libraries because while it shouldn t be normal it unfortunately is normal enough lol