GraphQL is a query language for your API, and a server-side runtime for executing queries by using a type system you define for your data. ... GraphQL isn't tied to any specific database or storage engine and is instead backed by your existing code and data. GraphQL follows the same set of constraints as REST APIs, but it organizes data into a graph using one interface. ... Each object is then backed by a resolver that accesses the server's data.GraphQL services typically respond using JSON, however the GraphQL spec does not require it. ... JSON is also very familiar to client and API developers, and is easy to read and debug. In fact, the GraphQL syntax is partly inspired by the JSON syntax.