SDK Generation
Generate typed client libraries from an API description.
All sdk generation tools
5- FernA hosted platform, owned by Postman since January 2026, that generates SDKs in nine languages and documentation sites from OpenAPI, AsyncAPI and gRPC definitions.Freemium
- KiotaMicrosoft's MIT-licensed command-line generator of strongly typed API clients from OpenAPI, built on shared per-language core libraries, with path filtering to generate only the operations you call.Open source
- OpenAPI GeneratorA community-maintained, Apache-2.0 generator of client SDKs, server stubs and documentation from OpenAPI 2.0 and 3.x, forked from Swagger Codegen in 2018.Open source
- SpeakeasyAn OpenAPI SDK generator for seven languages, plus CLI, MCP server and Terraform provider generation, open-sourced under AGPL-3.0 with commercial licensing.Freemium
- StainlessA hosted generator of SDKs, Terraform providers, MCP servers and docs from OpenAPI. Closed to new signups and projects since May 2026, when Stainless joined Anthropic and began winding down its hosted products.Freemium
