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Does anyone have experience implementing a GraphQL server in Kotlin? I'm trying to get a sense of what my options are. My preference is to use Ktor for my server in general. I have seen <https://kgraphql.io/> but I'm unsure, given the &lt; 1.0 release version, whether this is production ready.

I did some experimenting but never got as far as actually running in production.  <https://www.graphql-java.com/|GraphQL-Java> on its own was enough for what I needed. But the <https://opensource.expediagroup.com/graphql-kotlin/docs|Expedia libraries> look pretty good if you want more functionality. They even have some examples using Ktor as the server.

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Just found that, thank you. I think this is the best place to start

Was worried I'd have to do Spring, which I'd really like to avoid

As a previous poster already wrote the <https://opensource.expediagroup.com/graphql-kotlin/docs|Expedia libraries> are a pretty good library. It pursues a code centric approach to backend graphql. You can essentially write your data classes and define accessing classes for it which are simply passed to the (ktor-)module configuration to register your queries / mutations / subscriptions. Et voila you have an automatically generated gql-schema which you can use for your clients and a configurable endpoint to send you queries / mutations etc. to.  We have been using the library for quite a while now and the leverage that this code centric approach brings with it is quite neat.