GraphQL DSL in Emacs Lisp :D
<https://github.com/vermiculus/graphql.el/blob/master/graphql.el>
Example:
<https://github.com/vermiculus/graphql.el/blob/master/examples/examples.el>

John mentioned Alumbra for Clojure: <https://github.com/alumbra/alumbra>

Also for Clojure: Lacinia <https://github.com/walmartlabs/lacinia>