Any success implementing a `JSON` response with KTOR? Tried and got this: ``` java.lang.IllegalArgum...

# ktor

[Narayan Iyer]

Any success implementing a JSON response with KTOR? Tried and got this:

java.lang.IllegalArgumentException: Response pipeline couldn't transform 'class java.util.Collections$SingletonMap' to the OutgoingContent
	at io.ktor.server.engine.BaseApplicationResponse$$special$$inlined$apply$lambda$1.invokeSuspend(BaseApplicationResponse.kt:38)
	at io.ktor.server.engine.BaseApplicationResponse$$special$$inlined$apply$lambda$1.invoke(BaseApplicationResponse.kt)
	at io.ktor.util.pipeline.PipelineContext.proceed(PipelineContext.kt:53)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:24)

Checked out the documentation and saw this: install(ContentNegotiation) ... but documentation is sketchy ... any ideas?

[mp]

I made a toy project that shows how to do this (and other typical integrations): https://bitbucket.org/marshallpierce/ktor-demo/src/master/

[Sergio Casero]

You must declare with library will be used for ContentNegotiation

[Sergio Casero]

For example, gson

[Sergio Casero]

implementation "io.ktor:ktor-gson:$ktor_version"

[Sergio Casero]

install(ContentNegotiation) { gson {} }

[Narayan Iyer]

@Sergio Casero Yes I tried all that, but the contents of the gson { } block, its somewhat unclear as to what needs to go there!

[Narayan Iyer]

@mp will definitely take a look. Thanks 👍