A modern programming language that makes developers happier.

kotlinlang

Hi, please, is there any way how to use `encodeToString` of double in json for js (multiplatform) with trailing zeros?
In our case, we have test json with double format (with trailing zeros), we use `decodeFromString` and than `encodeToString` and compare it.
For JVM it is allright, but in JS output is without trailing zeros.

You're wanting to keep the trailing 0s in the serialized double?  That's not going to happen.  I'd add an Int field of # of digits or # of 0s to add.

Quick test for what I mean
```@Test
    fun testDecodeEncode() {
        val jsonTestData = "{\"foo\":0.0,\"bar\":1.25}"
        val testItemData: TestItem =
            Json.decodeFromString(
                jsonTestData
            )

        assertEquals(jsonTestData, Json.encodeToString(testItemData))
    }

    @Serializable
    data class TestItem(
        val foo: Double,
        val bar: Double,
    )```
What is OK for JVM, but for JS:
`AssertionError: Expected &lt;{"foo":0.0,"bar":1.25}&gt;, actual &lt;{"foo":0,"bar":1.25}&gt;.`

JS Number stringification is not only different from Java, it's different in different implementations: <https://kotlinlang.slack.com/archives/C0B8L3U69/p1634116661180600?thread_ts=1634116456.180200&amp;cid=C0B8L3U69>

If your requirements are about the deserialized values, it should be tested differently.
If your requirements are about the actual JSON, maybe reconsider the requirements? :slightly_smiling_face: More precisely, why should `0` be a problem in the JSON as opposed to `0.0`?

Thanks for replies, for now we changed test data as quick sollution.