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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.

127 records
Tagged “openapi3”Ranked by health index
npm · crates.io
100Exceptionalhealth index
scalar/scalar
Scalar is an open-source API platform:                                       🌐 Modern REST API Client                                        📖 Beautiful API References                                        ✨ 1st-Class OpenAPI/Swagger Support
TypeScript · Vue★ 16.1K↓ 8.3M/moSep 16, 2026
MITSep 16, 2026 · metrics 2.10.0
npm · Packagist
99Exceptionalhealth 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↓ 49.8M/moSep 16, 2026
Apache-2.0Sep 16, 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
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★ 26.7KSep 16, 2026
Apache-2.0Sep 16, 2026 · metrics 2.10.0
PyPI
96Exceptionalhealth index
fastapi/fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Python★ 102.4K↓ 414M/moSep 16, 2026
MITSep 16, 2026 · metrics 2.10.0
PyPI · NuGet · npm
96Exceptionalhealth index
microsoft/kiota
OpenAPI based HTTP Client code generator
C#★ 3,822Sep 12, 2026
MITSep 12, 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
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★ 3,205↓ 79.5M/moSep 16, 2026
Apache-2.0Sep 16, 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
95Exceptionalhealth index
usebruno/bruno
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
JavaScript · TypeScript★ 47K↓ 1.1M/moSep 16, 2026
MITSep 16, 2026 · metrics 2.10.0
npm
94Exceptionalhealth index
asyncapi/modelina
A library for generating typed models based on inputs such as AsyncAPI, OpenAPI, and JSON Schema documents with high customization
TypeScript★ 448↓ 667.3K/moSep 25, 2026
Apache-2.0Sep 25, 2026 · metrics 2.10.0
—
94Exceptionalhealth index
microsoft/OpenAPI.NET.OData
Generates OpenAPI document from OData CSDL
C#★ 239Sep 11, 2026
MITSep 11, 2026 · metrics 2.10.0
npm
94Exceptionalhealth index
mockoon/mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
TypeScript · HTML★ 8,389↓ 847.8K/moSep 7, 2026
MITSep 7, 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
swagger-api/apidom
Semantic parser for API specifications
TypeScript★ 100↓ 24.5M/moOct 12, 2026
Custom licenseOct 12, 2026 · metrics 2.10.0
npm
94Exceptionalhealth index
zuplo/zudoku
Framework for building high quality, interactive API documentation.
TypeScript★ 591↓ 130.7K/moSep 12, 2026
MITSep 12, 2026 · metrics 2.10.0
PyPI
92Excellenthealth index
apiflask/apiflask
A lightweight Python web API framework.
Python★ 1,136Sep 15, 2026
MITSep 15, 2026 · metrics 2.10.0
Maven
92Excellenthealth index
swagger-api/swagger-codegen
swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
Mustache · Java★ 17.8KOct 18, 2026
Apache-2.0Oct 18, 2026 · metrics 2.10.0
Maven
92Excellenthealth index
swagger-api/swagger-parser
Swagger Spec to Java POJOs
Java★ 868Oct 8, 2026
Apache-2.0Oct 8, 2026 · metrics 2.10.0
NuGet
91Excellenthealth index
christianhelle/refitter
Generate Refit interfaces and contracts from OpenAPI (Swagger) specifications
C#★ 416Sep 11, 2026
MITSep 11, 2026 · metrics 2.10.0
Go
91Excellenthealth index
oasdiff/oasdiff
OpenAPI Diff and Breaking Changes
Go★ 1,358Sep 14, 2026
Apache-2.0Sep 14, 2026 · metrics 2.10.0
Maven
91Excellenthealth 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★ 396Sep 9, 2026
MITSep 9, 2026 · metrics 2.10.0
npm
91Excellenthealth index
stoplightio/elements
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.
TypeScript★ 2,457↓ 719.6K/moSep 9, 2026
Apache-2.0Sep 9, 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★ 1,776Oct 19, 2026
MITOct 19, 2026 · metrics 2.10.0
PyPI
89Excellenthealth index
marshmallow-code/apispec
A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..
Python★ 1,219Sep 14, 2026
MITSep 14, 2026 · metrics 2.10.0
npm
88Excellenthealth index
OpenAPITools/openapi-generator-cli
A node package wrapper for https://github.com/OpenAPITools/openapi-generator
TypeScript★ 1,974Sep 14, 2026
Apache-2.0Sep 14, 2026 · metrics 2.10.0
npm
88Excellenthealth index
cloudflare/chanfana
OpenAPI 3 and 3.1 schema generator and validator for Hono, itty-router and more!
TypeScript★ 766↓ 302.1K/moSep 18, 2026
MITSep 18, 2026 · metrics 2.10.0
npm · PyPI
88Excellenthealth index
counterfact/api-simulator
Turn an OpenAPI spec into a local API in one command. Build and test your frontend with custom responses, shared state, and simulated failures, without waiting for the backend.
TypeScript · JavaScript · Astro★ 170↓ 28.2K/moSep 18, 2026
MITSep 18, 2026 · metrics 2.10.0