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Feature where you can write an endpoint to return whatever it is that you need. Granted, it’s not automatic as in some GraphQL frameworks - not sure if that’s what you meant by “arbitrary”. But then again, such things are a step beyond just using GraphQL as a protocol.

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The comparison would be;

REST: Any time there is a new "view"; you need to go to your server and write a new endpoint.

GraphQL: You can stitch data together however you want; as long as that data is defined.

So for example if I need name of someone and the url of their children; querying it alone is enough with GraphQL whereas with REST either I need to fetch multiple times or write a new endpoint that serves both together.

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