Has anyone had problems with json.encodeToStream truncating the JSON result? It worked fine w/ kotlinx.serialization 1.3.3, but 1.4.1/1.5.1/1.6.0 truncates the JSON (not even that big...300KB). Workaround is to use json.encodeToString() and write it out to a file.

Are you sure you're not leaving data in an intermediate buffer without a proper flush/close?

I did a writer.flush() to be sure...also tried adding delays in case it took a while to write, but fairly sure. Only thing changed was flipping kotlinx.serialization from 1.3.3 to 1.4+. I'll have to see if I can create a repro...

I'm using it for some larger json structures ~5MB in size and I don't have issues. This is what I'm doing:

Path(
    System.getProperty("user.home"),
    "Desktop",
    "filename.json",
).outputStream().use {
    Json.encodeToStream(mySerializableClass, it)
}

Im using 1.6 Might be worth seeing if using

use

and letting the stream close itself helps?

There is no 1.9. 1.6 is the latest.

Looked at the wrong version number in my project. Yeah I'm on 1.6. Fixed it

1.4 is where the abstraction between JVM streams and Okio streams was added. It's possible it had bugs. Is there a reason you're on a such an old version rather than going to 1.6?

Good to know that some major change did go in with 1.4. Yep, only noticed because someone bumped our kotlinx.serialization libs to the latest 1.6 and broke this bit of code and I had to backtrack a bit to find it. I should have mentioned the current and original code used writer.use {} to let it autoclose as well. I tried adding a flush in that but it made no difference. Will try to create a repro since this would be ugly for other folks to hit...