Three different operation types can be used to send requests to a GraphQL server: queries, mutations and subscriptions. Let’s look at them one by one. Queries The query operation is used when we want to retrieve data from the GraphQL server. You could compare it to an HTTP GET request in RESTful APIs. In...
What is the GraphQL schema?
Every GraphQL API has a schema. The schema is a detailed list of all the object types and operation types that exist on a given GraphQL server. You can see the schema as a dictionary describing the structure of the API. You can also see it as a map that will give you a...
What are GraphQL types?
Every language needs a grammar. If GraphQL is the language you can use to talk to an API, the GraphQL type system gives you the grammar that will make sure your queries are properly formatted and understood. Just like a programming language, GraphQL relies on types to define and describe every element you will...