Yes, it's very easy. In my case I use Jackson and ...

# http4k

[mmaillot]

Yes, it's very easy. In my case I use Jackson and I create this method for my test :
fun hasBodyJson(expected: String): Matcher<HttpMessage> = has("Body", { m: HttpMessage -> ObjectMapper().readTree(m.bodyString()) }, equalTo(ObjectMapper().readTree(expected)))

Thank you!