Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
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Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.
📘 OpenAPI/Swagger-generated API Reference Documentation
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
Swagger Editor
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x.
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
RapiDoc -WebComponent for OpenAPI Spec
⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.
GUI / visual editor for creating and editing OpenAPI / Swagger definitions
Precision documentation from OpenAPI, MCP, Doxygen, and Markdown guides. Static HTML you own.
Framework for building high quality, interactive API documentation.
OpenAPI based binary serialization