OpenAPI Generator: stats, trends and alternatives

trpc/trpc

End-to-end type-safe APIs for TypeScript monorepos without schemas or code generation.

grpc/grpc

High-performance RPC framework over HTTP/2 with Protocol Buffers; the standard for service-to-service calls.

protocolbuffers/protobuf

Google's language-neutral binary serialization format and IDL behind gRPC.

bufbuild/buf

Modern Protobuf toolchain for linting, breaking-change detection, code generation and a schema registry.

connectrpc/connect-go

CNCF Protobuf RPC protocol and libraries that speak gRPC, gRPC-Web and plain HTTP from browsers and servers.

middleapi/orpc

Type-safe RPC in the spirit of tRPC with first-class OpenAPI output and contract-first support.

OAI/OpenAPI-Specification

Vendor-neutral standard for describing HTTP APIs that drives docs, mocks, SDK and server generation.

swagger-api/swagger-ui

Ubiquitous interactive API documentation generated from OpenAPI definitions.

scalar/scalar

Modern open-source API reference and client for OpenAPI, increasingly replacing Swagger UI.

OpenAPI Generator