Queries - GraphQL
Learn how to fetch data from a GraphQL server. GraphQL supports three main operation types—queries, mutations, and subscriptions. We have already seen several examples of basic queries in this guide, and on this page, you’ll learn in detail how to use the various features of query operations to read data from a server. Fields
GraphQL | A query language for your API
Write GraphQL APIs that leverage your existing data and code with GraphQL engines available in many languages. You provide functions for each field in the type system, and GraphQL calls them with optimal concurrency.
Introduction to GraphQL
GraphQL is a query language for your API, and a server-side runtime for executing queries using a type system you define for your data. The GraphQL specification was open-sourced in 2015 and has since been implemented in a variety of programming languages.
GraphQL: A data query language
2015年9月13日 · What is GraphQL? A GraphQL query is a string that is sent to a server to be interpreted and fulfilled, which then returns JSON back to the client.
Schemas and Types - GraphQL
Type system directives can be applied to the types, fields, and arguments in a schema to alter how they are validated and executed during a query; GraphQL supports schema documentation using type, field, and argument descriptions, and it also supports comments that are …
Execution - GraphQL
Learn how GraphQL provides data for requested fields. After a parsed document is validated, a client’s request will be executed by the GraphQL server and the returned result will mirror the shape of the requested query. On this page, you’ll learn about the execution phase of GraphQL operations where data is read from or written to an ...
Response | GraphQL
One of GraphQL’s strengths is that the server response reflects the shape of the client’s original request, but a response may also contain helpful information if something unexpected happened before or during the execution of an operation. On this page, we’ll take a deeper exploration of this final phase in the lifecycle of a GraphQL ...
GraphQL
A GraphQL query can be parameterized with variables, maximizing query reuse, and avoiding costly string building in clients at runtime. Variables must be defined at the top of an operation and have global scope.
Serving over HTTP - GraphQL
Respond to GraphQL requests using an HTTP server. The GraphQL specification doesn’t require particular client-server protocols when sending API requests and responses, but HTTP is the most common choice because of its ubiquity. On this page, we’ll review some key guidelines to follow when setting up a GraphQL server to operate over HTTP.
graphql/utilities
The graphql/utilities module contains common useful computations to use with the GraphQL language and type objects. You can import either from the graphql/utilities module, or from the root graphql module.