fastapi/fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
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FastAPI framework, high performance, easy to learn, fast to code, ready for production
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
Design, Test and Document APIs in plain Markdown. Compose Requests with API blocks. Reuse, Replace & Version everything just like code. Offline, Truly Git Native, No Lock-in.
Huma REST/HTTP API Framework for Golang with OpenAPI 3.1
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
The Cloud-Native API Gateway and AI Gateway
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
Generate TypeScript types from OpenAPI 3 specs
A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML
The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀
Generate Go client and server boilerplate from OpenAPI 3 specifications
OpenAPI Diff and Breaking Changes
OpenAPI based HTTP Client code generator
openapi_first is a Ruby gem for request / response validation and contract-testing against an OpenAPI API description. It makes APIFirst easy and reliable.
:capital_abcd: Tool for generation samples based on OpenAPI(fka Swagger) payload/response schema
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
vacuum is the worlds fastest and most versatile OpenAPI, Arazzo, AsyncAPI & JSON Schema linter, docs generator and toolkit. It tears through API specs at light speed. 100% compatible with Spectral rulesets, and OpenAPI 3.0, 3.1 and 3.2
📘 OpenAPI/Swagger-generated API Reference Documentation
⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.
libopenapi is a fully featured, high performance OpenAPI 3.2, 3.1, 3.0, Overlays and Arazzo parser, library, validator and toolkit for go applications.
Shift-left API Integration | Auto-fix integration drift before integration. Specmatic turns API specifications into executable contracts, continuously verifying that every change made by AI coding agents and engineers stays true to the desired behaviour. Ship AI-ready APIs 10x faster, from intent to implementation, with Spec-Driven API Development.
Generates Kotlin Code from OpenAPI 3 Specifications
Precision documentation from OpenAPI, MCP, Doxygen, and Markdown guides. Static HTML you own.
Generate Refit interfaces and contracts from OpenAPI (Swagger) specifications
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
Generate modern Python clients from OpenAPI
Generates OpenAPI document from OData CSDL
Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.
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