Introduction to Graphql
summary
GraphQL is a query language with a strict type system and an introspection API that returns exactly the requested shape, supports mutations, fragments for composition, and runs on arbitrary code so it can wrap existing REST endpoints. Facebook moves News Feed to GraphQL and serves about 300 billion requests per day. The project ships an open spec and a reference implementation in JavaScript, plus tools like GraphiQL and Relay; demos show single-round-trip joins and production use at scale.
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