On this page, you’ll learn how to use mutation operations to write data using GraphQL, and do so in a way that supports client use cases. All of the features of GraphQL operations that apply to …

Now that we understand the ins and outs of how to read data from a GraphQL server with query operations, it’s time to learn how to change data and trigger side effects using mutations.

Explore how GraphQL operates over HTTP, including methods, headers, status codes and API endpoint design. Handle file uploads in GraphQL by wrapping them as mutations.

Schemas may also support mutation and subscription operations by adding additional Mutation and Subscription types and then defining fields on the corresponding root operation types.

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.

Though not yet finalized, this draft specification acts as a single source of truth for GraphQL client and library maintainers, detailing how to expose and consume a GraphQL API using an HTTP …

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 and …

When building or consuming a GraphQL API over HTTP, it’s common to run into errors, especially during development. Understanding how to recognize and resolve these issues can save you …

If the API supports mutations to write data and subscriptions to fetch real-time data as well, then it will have Mutation and Subscription types that expose fields to perform these kinds of …

Some articles introduce some of the philosophy developed within Facebook around designing and deploying GraphQL services, while others are more tactical suggestions for solving common …