How do I send json in form data from the ktor client and receive it on a ktor server? I need multipl...

# ktor

[dave08]

How do I send json in form data from the ktor client and receive it on a ktor server? I need multiple keys (json and json2) with json data in them in the same request.

[Berkay Özkan]

https://ktor.io/docs/request.html#form_parameters did you check here

[dave08]

It seems like submitForm and recieveParameters doesn't work (even if I take care of serialization/deserialization)

[dave08]

And that's all that seems to be documented... I even tried:

submitFormWithBinaryData(
                url = "/",
                formData = listOf(
                    PartData.FormItem(
                        Json.encodeToString(fooJsonString),
                        {},
                        partHeaders = headersOf(
                            HttpHeaders.ContentType to listOf(ContentType.Application.Json.let { "${it.contentType}/${it.contentSubtype}" })
                        )
                    )
                )
            )

[dave08]

with:

val formParameters = call.receiveMultipart()
Json.decodeFromString((formParameters.readPart() as PartData.FormItem).value)

[dave08]

and that also doesn't work... (and doesn't give me the ability to name the form parts either...)

[Aleksei Tirman [JB]]

Please have a look at this example.

[Aleksei Tirman [JB]]

The first parameter for the append is the name

[dave08]

I just noticed that (even though the name is uploading a file), but it doesn't allow specifying a content type, and how do I receive that on the server side as the object it started off as?

[dave08]

I see that there's

@InternalAPI
public final fun <T : Any> append(
    key: String,
    value: T,
    headers: Headers
): Unit

but it's internal api... so I need to handle serialization/deserialization myself?

[dave08]

It might one day be nice to add an append() and a way to receive such a serialized/deserialized object using the installed ContentNegotiation...

[dave08]

But thanks! Now it seems to be working.