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can I use `kotlinx` to append a JSON object to an existing JSON file?

I’m not sure, I understand your use case. A Json file contains only one object, so what does ‘append’ mean?

You can of course load an object from a json file, add other keys with values to it and save it.

yeah, that's what I've settled on. thanks.

regarding this: what is the Kotlin-endorsed way to have a seekable file writer? a `RandomAccessFile`?

<https://github.com/Kotlin/kotlinx.serialization/blob/master/guide%2Fexample%2Fexample-json-15.kt|https://github.com/Kotlin/kotlinx.serialization/blob/master/guide%2Fexample%2Fexample-json-15.kt>
Read json from file, then parse to json elements.

<https://blog.jetbrains.com/kotlin/2021/09/kotlinx-serialization-1-3-released/#io-stream-serialization|https://blog.jetbrains.com/kotlin/2021/09/kotlinx-serialization-1-3-released/#io-stream-serialization>
Samples here how decode directly from file or url