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#openapi3

Every repository in the public record carrying this tag — from its GitHub topics or the keywords its package registries publish. Health is measured under the same versioned methodology as the rest of the record.

85 records
Tagged “openapi3”Ranked by health index
npm · crates.io · PyPI
99Exceptionalhealth index
scalar/scalar
Scalar is an open-source API platform:                                       🌐 Modern REST API Client                                        📖 Beautiful API References                                        ✨ 1st-Class OpenAPI/Swagger Support
TypeScript · Vue★ 15.8K↓ 6.1M/moAug 5, 2026
MITAug 5, 2026 · metrics 2.10.0
PyPI
98Exceptionalhealth index
fastapi/fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Python★ 101.3K↓ 550M/moAug 4, 2026
MITAug 4, 2026 · metrics 2.10.0
npm
98Exceptionalhealth index
microsoft/kiota
OpenAPI based HTTP Client code generator
C#★ 3,786Jul 20, 2026
MITJul 20, 2026 · metrics 2.10.0
npm
98Exceptionalhealth index
microsoft/typespec
No repository description published.
Java · TypeScript · C#★ 5,837↓ 2.1M/moAug 28, 2026
MITAug 28, 2026 · metrics 2.10.0
npm
98Exceptionalhealth index
JavaScript · TypeScript★ 9,461↓ 49.5K/moAug 28, 2026
Custom licenseAug 28, 2026 · metrics 2.10.0
npm · Packagist
98Exceptionalhealth index
swagger-api/swagger-ui
Swagger UI is a collection of HTML, JavaScript, and CSS assets that dynamically generate beautiful documentation from a Swagger-compliant API.
JavaScript★ 29K↓ 50.3M/moAug 5, 2026
Apache-2.0Aug 5, 2026 · metrics 2.10.0
Maven
96Exceptionalhealth index
OpenAPITools/openapi-generator
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)
Java★ 26.6KAug 5, 2026
Apache-2.0Aug 5, 2026 · metrics 2.10.0
npm
96Exceptionalhealth index
stoplightio/prism
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations.
TypeScript★ 5,017↓ 3.3M/moAug 27, 2026
Apache-2.0Aug 27, 2026 · metrics 2.10.0
npm
96Exceptionalhealth index
swagger-api/swagger-client
Javascript library to connect to swagger-enabled APIs via browser or nodejs
JavaScript★ 2,694Aug 27, 2026
Apache-2.0Aug 27, 2026 · metrics 2.10.0
npm
96Exceptionalhealth index
usebruno/bruno
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
JavaScript · TypeScript★ 46.1K↓ 4.7M/moAug 5, 2026
MITAug 5, 2026 · metrics 2.10.0
npm
96Exceptionalhealth index
zuplo/zudoku
Framework for building high quality, interactive API documentation.
TypeScript★ 561↓ 3,737/moJul 20, 2026
MITJul 20, 2026 · metrics 2.10.0
npm
95Exceptionalhealth index
asyncapi/modelina
A 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
Apache-2.0Jul 20, 2026 · metrics 2.10.0
PyPI
95Exceptionalhealth index
marshmallow-code/apispec
A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..
Python★ 1,218Jul 28, 2026
MITJul 28, 2026 · metrics 2.10.0
Go
94Exceptionalhealth index
oapi-codegen/oapi-codegen
Generate Go client and server boilerplate from OpenAPI 3 specifications
Go · Go Template★ 8,542Aug 28, 2026
Apache-2.0Aug 28, 2026 · metrics 2.10.0
npm
94Exceptionalhealth index
stoplightio/spectral
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.
TypeScript★ 3,172↓ 78M/moAug 4, 2026
Apache-2.0Aug 4, 2026 · metrics 2.10.0
92Excellenthealth index
Microsoft/OpenAPI.NET.OData
Generates OpenAPI document from OData CSDL
C#★ 240Jul 18, 2026
MITJul 18, 2026 · metrics 2.10.0
Go · npm
90Excellenthealth index
go-fuego/fuego
Golang Fuego - Web framework generating OpenAPI 3 spec from source code - Pluggable to existing Gin & Echo APIs
Go★ 1,762Aug 18, 2026
MITAug 18, 2026 · metrics 2.10.0
npm
90Excellenthealth index
stoplightio/elements
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
TypeScript★ 2,441Jul 16, 2026
Apache-2.0Jul 16, 2026 · metrics 2.10.0
npm
88Excellenthealth index
OpenAPITools/openapi-generator-cli
A node package wrapper for https://github.com/OpenAPITools/openapi-generator
TypeScript★ 1,964Jul 28, 2026
Apache-2.0Jul 28, 2026 · metrics 2.10.0
Go
88Excellenthealth index
danielgtaylor/huma
Huma REST/HTTP API Framework for Golang with OpenAPI 3.1
Go★ 4,354Aug 28, 2026
MITAug 28, 2026 · metrics 2.10.0
PyPI
88Excellenthealth index
msgspec/msgspec
A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML
Python · C★ 4,063Aug 27, 2026
BSD-3-ClauseAug 27, 2026 · metrics 2.10.0
Maven
88Excellenthealth index
networknt/json-schema-validator
A fast Java JSON schema validator that supports draft V4, V6, V7, V2019-09 and V2020-12
Java★ 1,073Jul 30, 2026
Apache-2.0Jul 30, 2026 · metrics 2.10.0
Go
88Excellenthealth index
oasdiff/oasdiff
OpenAPI Diff and Breaking Changes
Go★ 1,293Jul 27, 2026
Apache-2.0Jul 27, 2026 · metrics 2.10.0
Go
88Excellenthealth index
pb33f/libopenapi
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.
Go★ 859Jul 18, 2026
MITJul 18, 2026 · metrics 2.10.0
Maven
88Excellenthealth index
specmatic/specmatic
Eliminate 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
MITJul 17, 2026 · metrics 2.10.0
87Excellenthealth index
christianhelle/refitter
A tool for generating Refit interfaces and contracts from OpenAPI (Swagger) specifications
C#★ 411Jul 18, 2026
MITJul 18, 2026 · metrics 2.10.0
PyPI
87Excellenthealth index
python-openapi/openapi-core
Openapi-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★ 369↓ 3.8M/moAug 27, 2026
BSD-3-ClauseAug 27, 2026 · metrics 2.10.0
Go
87Excellenthealth index
speakeasy-api/speakeasy
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.
JavaScript · Go★ 424Jul 15, 2026
Custom licenseJul 15, 2026 · metrics 2.10.0
npm
86Excellenthealth index
openapi-ts/openapi-typescript
Generate TypeScript types from OpenAPI 3 specs
TypeScript★ 8,305↓ 80.4M/moAug 12, 2026
MITAug 12, 2026 · metrics 2.10.0