Directory

Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

All Packages

90Health
Framework PyPI

FastAPI

A modern, high-performance Python web framework for building APIs with automatic validation, serialization, and interactive docs.

102,333
MIT
Used by 76
65Health
Tool npm

openapi-typescript

Generate type-safe TypeScript types directly from your OpenAPI 3.0 and 3.1 schemas.

8,366
MIT
Used by 33
46Health
Library npm

openapi-types

Type-safe TypeScript definitions for OpenAPI 2.0, 3.0, and 3.1 specification documents, covering paths, schemas, and components.

921
MIT
Used by 25
90Health
Library npm

Scalar API Reference

Interactive, embeddable API reference documentation generated from your OpenAPI or Swagger specs.

16,101
MIT
Used by 22
95Health
Tool Go

grpc-gateway

A protoc plugin that generates a reverse-proxy server, turning RESTful HTTP/JSON requests into gRPC calls from the same service definitions.

20,003
BSD 3
Used by 16
85Health
Tool npm

openapi-ts

OpenAPI-to-TypeScript code generator producing production-grade SDKs, Zod schemas, and TanStack Query hooks.

5,406
MIT
Used by 14
91Health
Library Go

kin-openapi

A Go library for parsing, validating, converting, and working with OpenAPI 2.0, 3.0, 3.1, and 3.2 documents.

3,293
MIT
Used by 14
60Health
Library npm

@apidevtools/swagger-parser

Parses, validates, and dereferences Swagger 2.0 and OpenAPI 3.x specs in Node.js and browsers

1,207
MIT
Used by 14
77Health
Library PyPI

drf-spectacular

Sane, flexible OpenAPI 3.0/3.1/3.2 schema generation for Django REST Framework

2,860
BSD 3
Used by 13
98Health
Library npm

swagger-ui-react

A React component that turns OpenAPI/Swagger specs into interactive, browsable API documentation.

29,010
Apache 2.0
Used by 12
64Health
Library npm

zod-openapi

Generate OpenAPI 3.x documentation directly from your existing Zod schemas.

643
MIT
Used by 11
67Health
Tool Go

swag

Generates Swagger 2.0 API documentation directly from declarative comments above your Go handler functions.

13,018
MIT
Used by 9
81Health
Library npm

@fastify/swagger

Generates and serves OpenAPI/Swagger documentation directly from your Fastify route schemas

1,094
MIT
Used by 9
80Health
Library Cargo

utoipa

Compile-time generated OpenAPI documentation for Rust APIs

4,085
Apache 2.0
Used by 8
91Health
Tool npm

Docusaurus OpenAPI Docs

Docusaurus plugin that generates polished API reference docs directly from an OpenAPI spec

1,102
MIT
Used by 7
86Health
Library npm

oRPC Client

Type-safe client for consuming oRPC and OpenAPI APIs over HTTP, WebSocket, or message ports.

5,619
MIT
Used by 6
61Health
Library npm

openapi3-ts

Typed TypeScript models and a fluent builder DSL for authoring OpenAPI 3.0, 3.1, and 3.2 contracts.

540
MIT
Used by 6
79Health
Library npm

@fastify/swagger-ui

Serves an interactive Swagger UI inside a Fastify app, rendered directly from the OpenAPI spec that @fastify/swagger already generates.

191
MIT
Used by 6
79Health
Library PyPI

referencing

Implementation-agnostic JSON reference resolution for JSON Schema, OpenAPI, and beyond

53
MIT
Used by 6
75Health
Library PyPI

Standard Webhooks (Python)

Python reference implementation for verifying Standard Webhooks HMAC-signed webhook payloads

1,746
Apache 2.0
Used by 5
89Health
Tool Composer

Scramble

Modern Laravel OpenAPI (Swagger) documentation generator with no PHPDoc annotations required

2,206
MIT
Used by 3
74Health
Library Go

libopenapi

A high-performance Go library for parsing, validating, mutating, bundling, and diffing OpenAPI 3.2/3.1/3.0, Swagger, Overlay, and Arazzo documents.

872
MIT
Used by 3
80Health
Library npm

redocusaurus

Adds OpenAPI documentation to a Docusaurus site by rendering Redoc-powered API reference pages alongside your existing docs.

744
MIT
Used by 3
66Health
Library npm

openapi-types.ts

Generated TypeScript definitions built continuously from GitHub's official OpenAPI specification.

55
MIT
Used by 3

Join founders buildingwith open source

Opinionated takes, migration guides, cost-saving tips, and insights from the open source ecosystem.

Subscribe on Substack
Join 750+ subscribers