npm · PyPI · crates.io89Excellenthealth index
scalar/scalarScalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
TypeScript · Vue★ 15.7K↓ 7.2M/moJul 21, 2026
npm · Packagist87Excellenthealth index
swagger-api/swagger-uiSwagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.
JavaScript★ 28.9K↓ 47.4M/moJul 22, 2026
PyPI86Excellenthealth index
fastapi/fastapiFastAPI framework, high performance, easy to learn, fast to code, ready for production
Python★ 100.8K↓ 511M/moJul 22, 2026
npm86Excellenthealth index
microsoft/typespecNo repository description published.
Java · TypeScript · C#★ 5,795Jul 17, 2026
npm85Excellenthealth index
microsoft/kiotaOpenAPI based HTTP Client code generator
C#★ 3,786Jul 20, 2026
JavaScript · TypeScript★ 9,457↓ 51.2K/moJul 21, 2026
asyncapi/modelinaA library for generating typed models based on inputs such as AsyncAPI, OpenAPI, and JSON Schema documents with high customization
TypeScript★ 442↓ 648.8K/moJul 20, 2026
zuplo/zudokuFramework for building high quality, interactive API documentation.
TypeScript★ 561↓ 3,737/moJul 20, 2026
stoplightio/prismTurn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
TypeScript★ 4,990↓ 2.5M/moJul 21, 2026
usebruno/brunoOpensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
JavaScript★ 45.6K↓ 0/moJul 13, 2026
OpenAPITools/openapi-generatorOpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
Java★ 26.6KJul 20, 2026
oapi-codegen/oapi-codegenGenerate Go client and server boilerplate from OpenAPI 3 specifications
Go · Go Template★ 8,472Jul 22, 2026
Microsoft/OpenAPI.NET.ODataGenerates OpenAPI document from OData CSDL
C#★ 240Jul 18, 2026
stoplightio/spectralA 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.
TypeScript★ 3,155↓ 69.8M/moJul 21, 2026
jcrist/msgspecA fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML
Python · C★ 3,860↓ 41.4M/moJul 17, 2026
python-openapi/openapi-coreOpenapi-core is a Python library that adds client-side and server-side support for the OpenAPI v3.0 and OpenAPI v3.1 and OpenAPI v3.2 specification.
Python★ 367↓ 4.1M/moJul 21, 2026
danielgtaylor/humaHuma REST/HTTP API Framework for Golang with OpenAPI 3.1
Go★ 4,249Jul 19, 2026
stoplightio/elementsBuild beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
TypeScript★ 2,441Jul 16, 2026
christianhelle/refitterA tool for generating Refit interfaces and contracts from OpenAPI (Swagger) specifications
C#★ 411Jul 18, 2026
pb33f/libopenapilibopenapi is a fully featured, high performance OpenAPI 3.2, 3.1, 3.0, Overlays and Arazzo parser, library, validator and toolkit for go applications.
Go★ 859Jul 18, 2026
python-openapi/openapi-spec-validatorOpenAPI Spec Validator is a CLI, pre-commit hook and python package that validates OpenAPI Specs against the OpenAPI 2.0 (aka Swagger), OpenAPI 3.0 and OpenAPI 3.1 specification.
Python★ 407↓ 45.8M/moJul 18, 2026
specmatic/specmaticEliminate API integration headaches with Specmatic's no-code AI-powered API development suite. Teams ship APIs 10x faster by transforming specifications into executable contracts instantly—no coding required, no integration surprises.
Kotlin★ 390Jul 17, 2026
RonnyPfannschmidt/pranceResolving Swagger/OpenAPI 2.0 and 3.0 Parser
Python★ 262↓ 5.6M/moJul 19, 2026
speakeasy-api/speakeasyBuild APIs your users love ❤️ with Speakeasy. ✨ Polished and type-safe SDKs. 🌐 Terraform providers, MCP servers, CLIs and Contract Tests for your API. OpenAPI native.
JavaScript · Go★ 424Jul 15, 2026
python-openapi/openapi-schema-validatorOpenAPI schema validator is a Python library that validates schema against OpenAPI Schema Specification v3.0 and v3.1
Python★ 125↓ 26.7M/moJul 18, 2026
tfranzel/drf-spectacularSane and flexible OpenAPI 3 schema generation for Django REST framework.
Python★ 2,847Jul 18, 2026
npm · Go70Goodhealth index
daveshanley/vacuumvacuum is the worlds fastest and most versatile OpenAPI, 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
Go★ 1,103↓ 169.8K/moJul 19, 2026
nelthaarion/breezeBreeze — High-Performance Golang Network Framework
Go★ 63Jul 17, 2026
RubyGems68Moderatehealth index
ahx/openapi_firstopenapi_first is a Ruby gem for request / response validation and contract-testing against an OpenAPI API description. It makes APIFirst easy and reliable.
Ruby★ 219Jul 20, 2026
npm68Moderatehealth index
the-codegen-project/cliYour one stop boilerplate killer for any standard!
JavaScript★ 35↓ 2,137/moJul 20, 2026