GraphQL puts discoverability front and centre, by prioritizing introspection and static typing. GraphiQL (the browser-based GraphQL explorer) is pretty hard to beat.
Because 90% of the "REST" developers don't actually build hypermedia apis, so they aren't really "REST" if you denote "REST" as somewhat complies with Roy Fielding's paper where he invented the acronym REST
Check out Github's GraphQL explorer for a great example of this: https://developer.github.com/early-access/graphql/explorer/