gqlgen

Overview gqlgen is a Go library for building GraphQL servers using a schema-first approach. You define your API with the GraphQL Schema Definition Language, and gqlgen generates the type-safe boilerplate code automatically. Unlike other Go GraphQL implementations that rely on map[string]interface{} and runtime reflection, gqlgen generates concrete Go types at build time. This makes it suitable for Go developers who want compile-time type safety and faster server performance. Key Benefits Schema-first code generation eliminates manual boilerplate and reduces bugs. Type-safe generated code never uses map[string]interface{} — all types are concrete Go structs. Field resolvers execute concurrently in separate goroutines with configurable worker limits. Supports custom models and explicit resolvers to control when child objects are fetched. Built-in support for dataloaders, file uploads, subscriptions, and Apollo Federation. How It Works You define your API using the GraphQL Schema Definition Language in a .graphql file. You run gqlgen init to generate config and model files, then implement the resolver interfaces gqlgen creates for you. Finally, you start the server with go run server.go and your GraphQL endpoint is live. Use Cases Go backend engineers building production GraphQL APIs with strict type safety. API teams adopting a schema-first workflow where the schema is the single source of truth. Developers migrating from REST to GraphQL who want generated resolvers and models. Teams building federated GraphQL gateways using Apollo Federation support. Open-source contributors building Go services that need subscriptions, file uploads, and dataloaders. Why Choose This Product gqlgen is best suited for Go developers who want a type-safe, schema-first GraphQL server with minimal manual wiring. It is open source and free to use. The library is actively maintained on GitHub with version v0.17.94 as the latest release.