👨🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode, PayPal, AWS, Autodesk, and many more.
Input OpenAPI. Output SDKs and Docs.
Generates a PHP SDK based on a WSDL, simple and powerful, WSDL to PHP
Generating SDKs for multiple programming languages and platforms ⚙️
The open-source Stainless — point your existing stainless.yml at it and get the same idiomatic Python SDK. Zero migration. No SaaS.
easytemplate is Go's text/template with 🦸 JS super powers 🦸
Best-in-class SDKs generated from OpenAPI, in your favorite languages
JS-SDKGen is a Javascript SDK Code generator for your API. It uses apidoc definitions from swagger or apidocjs and generates the Javascript SDK automatically. Along with SDK, it also generates SDK usage documentation, thus saving hours of work for you in writing SDK & usage documentation
Generate fully typed GraphQL client SDKs for Go and TypeScript — builder pattern with dynamic field selection, one shared type per GraphQL type, no query-first codegen loop
A GitHub Action that installs the Fern CLI into a workflow using npm.
Generate typed Python API clients from OpenAPI 3.0/3.1 specs, built on unihttp. adaptix/pydantic/msgspec models, sync & async clients, mypy --strict-clean output
SDKgen is a powerful code generator to automatically build client SDKs for your REST API.
Comparing Swift SDKs from different SDK generator tools for the same OpenAPI spec.
Local-first OpenAPI workspace to import specs, test requests, compare contracts, mock APIs, and generate SDKs
Configuration for generating SDKs and Documentation.
One spec, every SDK. Self-hosted, air-gapped OpenAPI SDK generator: idiomatic SDKs in 6 languages (TS/Python/Go/Java/Ruby/C#) + an MCP server, zero runtime deps, verified on every build.
Google Sheets as a real backend. Serialized writes, idempotent retries, typed SDKs.
An opinionated OpenAPI normalizer and code generator for creating clean, minimal, and modern client SDKs.
OpenAPI SDK generator for humans. Type-safe, async-first, developer-friendly.
[Demo] A Fern configuration that generates Docs & SDKs for Stripe's API.
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