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
Generate Refit interfaces and contracts from OpenAPI (Swagger) specifications
OpenAPI Diff and Breaking Changes
OpenAPI based HTTP Client code generator
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.
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
Build APIs your users love ❤️ with Speakeasy. ✨ Polished and type-safe SDKs. 🌐 Terraform providers, MCP servers, CLIs and Contract Tests for your API. OpenAPI native.
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.
😎 A list of awesome projects related to OpenAPI 3.0.x, curated by the community
A collection of open-source and commercial tools for creating your APIs with OpenAPI - Sourced from and published for the community
The OpenAPI v3 specification for DigitalOcean's public API.
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.
Generates Kotlin Code from OpenAPI 3 Specifications
Precision documentation from OpenAPI, MCP, Doxygen, and Markdown guides. Static HTML you own.
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
Generate modern Python clients from OpenAPI
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