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GraphQL is an open-source data query and manipulation language for APIs, and a runtime for fulfilling queries with existing data.

GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.

It provides an approach to developing web APIs and has been compared and contrasted with REST and other web service architectures. It allows clients to define the structure of the data required, and the same structure of the data is returned from the server, therefore preventing excessively large amounts of data from being returned, but this has implications for how effective web caching of query results can be. The flexibility and richness of the query language also adds complexity that may not be worthwhile for simple APIs. It consists of a type system, query language and execution semantics, static validation, and type introspection.

GraphQL supports reading, writing (mutating), and subscribing to changes to data. GraphQL servers are available for multiple languages, including Haskell, JavaScript, Perl, Python, Ruby, Java, C++, C#, Scala, Go, Elixir, Erlang, PHP, R, and Clojure.

oGaTe and IIX Gateway (Insurance oGaTe) support GraphQL API