GraphQL Language Service

Official language service for GraphQL, providing LSP-compatible methods for IDEs and editors. Version 5.5.2 supports GraphQL 15.x, 16.x, and 17.x. Maintained by the GraphiQL team, it offers parser, utilities, and interface for building GraphQL IDE features. Includes autocompletion, diagnostics, hover info, go-to-definition, and document symbols. Still somewhat experimental but built on stable libraries. Key differentiator: standalone and runtime independent, designed for use in both Node and browser environments.