A GraphQL schema defines available capabilities; GraphQL Code Generator combines it with actual queries, mutations, and fragments to emit precise results, variables, and typed documents.
gRPC generates cross-language stubs from Protobuf services. A Connect server can support gRPC, gRPC-Web, and the Connect protocol together, avoiding a translating proxy for browsers.
Hono RPC exports a route's `typeof AppType` so `hc` can infer inputs, response bodies, and status codes. The shared artifact is a TypeScript type, not an independent wire schema.
oRPC supports implementation-first and contract-first APIs, offers an RPC client, and can expose the same router through OpenAPI 3.1.1 HTTP endpoints.
Protobuf defines binary messages with stable field numbers; Buf adds modules, linting, remote plugins, generation, and breaking-change checks to govern those schemas.
tRPC lets a client reference the server router type without a separate schema or code generation. Version 11 also has an official, alpha-stage OpenAPI 3.1 generator.
ts-rest describes methods, paths, status codes, and schemas in a shared contract, providing end-to-end server and client types without a code-generation step.
Zodios uses a central Zod endpoint definition for Axios client types, runtime validation, and aliases, with optional Express and OpenAPI packages.