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From what I understand you build that bit yourself

https://www.reindex.io/blog/building-a-graphql-server-with-n...

As I understand it, this is still 100% client-side. GraphQL is basically a new schema language for defining a web service contract. You still need a complete server-side implementation to satisfy the schema. And unless you're doing it in node, there is probably no tooling in your language.

GraphQL is very new at this point, so there aren't many backends/databases that support it. If it catches on I imagine that will change very rapidly.