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 …

In this tutorial-style introduction to GraphQL, you'll learn the core concepts that power every GraphQL API. Follow a step-by-step path from basic queries to advanced features.

What is GraphQL? GraphQL is an open‑source query language for APIs and a server‑side runtime. It provides a strongly‑typed schema to define relationships between data, making APIs more flexible …

GraphQL allows you to add documentation to the types, fields, and arguments in a schema. In fact, the GraphQL specification encourages you to do this in all cases unless the name of the type, field, or …

GraphQL Specification Versions GraphQL

The reference implementation of the GraphQL specification, designed for running GraphQL in a Node.js environment.

Thus, for any spec-compliant GraphQL schemas, only the top-level fields in mutation operations are allowed to cause side effects. On this page, you’ll learn how to use mutation operations to write data …

This guide outlines common HTTP and GraphQL errors, what they mean, and how to debug them effectively. It follows the recommendations of the GraphQL over HTTP spec (draft), which …

Now that you understand the different phases of a GraphQL request and how responses are provided to clients, head over to the Introspection page to learn about how a GraphQL server can query …

In addition to reading and writing data using stateless query and mutation operations, the GraphQL specification also describes how to receive real-time updates via long-lived requests.