graph-gophers/graphql-go

graphql-go is a library for building GraphQL servers in the Go programming language. GraphQL is a way of defining an API where clients request exactly the data they need, specifying the shape of the response in their query rather than getting a fixed data structure back from an endpoint. This library lets Go developers write a server that accepts and responds to those queries. The basic approach is to define your API shape as a schema string using GraphQL's own type language, then connect it to Go code called resolvers that fetch the actual data. The library matches schema fields to Go methods automatically based on name, without requiring annotations or a code generator. It checks at startup that all schema fields have matching resolver methods, catching mismatches before any requests arrive. For a real application, resolvers often need to call a database or external service to get their data. The library runs independent resolvers in parallel to speed things up, and provides helpers that let a resolver inspect which child fields were requested in the current query. This can help avoid the N+1 problem, where a naive implementation makes one database query per item in a list instead of batching them together. The library also handles panics inside resolvers so a single bad resolver cannot crash the whole server. Beyond basic queries and mutations, the library supports subscriptions for streaming data and integrates with OpenTelemetry and OpenTracing for request tracing. Configuration options let you set limits on query depth and parallelism, control tracing behavior, and enable or disable introspection. There is also a sample WebSocket transport available in a companion repository. The project targets full compliance with the September 2025 GraphQL specification and is described as safe for production use.