OpenAPI.Tools

We want to keep API developers up to date with the best OpenAPI tooling around, with the goal of upgrading to OpenAPI v3 as soon as possible. Tooling stuck on v2? You might need to send a pull request!

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This project was created by Matthew Trask and Phil Sturgeon with contributions from the community. If you need help, hit Matt or Phil up on twitter.

Current OpenAPI Version

3.0.1 - Link to the specification

Converters

Name Language v2 v3 GitHub
Apimatic Transformer - Transform API Descriptions to formats to and from RAML, API Blueprint, OAI v2/v3, WSDL, etc. SaaS βœ… βœ…
API Flow - Convert from and to multiple formats. Linking to Phil's fork because the original is completely broken JavaScript βœ… πŸ‘·
Google Gnostic - Compile OpenAPI descriptions into equivalent Protocol Buffer representations Go ❌ βœ…
swagger2openapi - Upgrade specs from OpenAPI v2.0 to v3.0, bundling into one mega file or respecting $refs Node.js βœ… βœ…
OAS RAML Converter - Converts between OAS and RAML API specifications Node.js βœ… βœ…
OData OpenAPI - OData 4.0 to OpenAPI 3.0.0 converter XSLT βœ… βœ…
OpenAPI Filter - Filter internal components from OpenAPI definitions Node.js βœ… βœ…
OData.OpenAPI - Convert an Edm (Entity Data Model) to OpenApi 3.0 .NET ❌ βœ…
pyswagger - Client & converter in Python, which is type-safe, dynamic, spec-compliant. Python βœ… πŸ‘·
odata2openapi - OData 4.0 to OpenAPI 2 converter Node.js βœ… ❌
OpenAPI Generator - A template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI definition (community-driven fork of swagger-codegen) Java βœ… βœ…
go-swagger - Everything all in one. Parser, validator, generates spec from code, or code from spec! Go βœ… πŸ‘·

Documentation

Name Language v2 v3 GitHub
APIMatic Developer Experience Portal - Customizable developer portals packed with language specific documentation, client libraries, code samples, an API console and much more. SaaS βœ… βœ…
Kong Enterprise Edition - Highly customizable developer portal with developer onboarding, integrated with the Kong API Gateway Lua βœ… βœ…
openapi-viewer - Browse and test a REST API described with the OpenAPI 3.0 Specification Vue.js ❌ βœ…
openapi-ui - React based OpenAPI 3.0+ documentation generator React.js ❌ βœ…
ReDoc - OpenAPI/Swagger-generated API Reference Documentation React.js βœ… βœ…
widdershins - Generate Slate/Shins markdown from OpenAPI 2.0/3.0.x Node.js βœ… βœ…
openapi3-generator - Use your API OpenAPI 3 definition to generate code, documentation, and literally anything you need. Node.js ❌ βœ…

Editors

Name Language v2 v3 GitHub
KaiZen-OpenAPI-Editor - Full-featured Eclipse editor for OpenAPI 2.0 and 3.0, also available on Eclipse Marketplace. Java βœ… βœ…
Atom/linter-swagger - This plugin for Atom Linter will lint Swagger 2.0 specifications or OpenAPI 3.0, both JSON and YAML using swagger-parser node package. JavaScript βœ… βœ…
Swagger Editor - Design, describe, and document your API on the first open source editor fully dedicated to OpenAPI-based APIs. Node.js βœ… βœ…
RepreZen API Studio - RepreZen API Studio is an integrated workbench that brings API-first design into focus for your whole team, harmonizes your API designs, and generates APIs that click into client apps. Java βœ… βœ…
Apicurio Studio - A standalone API design studio that can be used to create new or edit existing API designs. TypeScript βœ… βœ…
RΓ‘pido - An API design tool that facilitates the sketching phase of design. Node.js ❌ βœ…
Stoplight - Stoplight is the Complete OpenAPI Specification Toolkit that leverages your OpenAPI documents to drive the entire API development process SaaS βœ… βœ…
SwaggerHub - API design and documentation platform to improve collaboration, standardize development workflow and centralize their API discovery and consumption. SaaS/On-Premise NodeJS βœ… βœ…
Senya Editor - Design API specifications fast and effectively​ in your favorite JetBrains IDE. Java βœ… βœ…
VSCode/openapi-lint - OpenAPI (Swagger) 2.0/3.0.x intellisense, validator and linter for Visual Studio Code Node.js βœ… βœ…

Mock Servers

Name Language v2 v3 GitHub
Prism - Turn any OAI file into an API server with mocking, transformations, validations, and more. cli βœ… πŸ‘·
Sandbox - SaaS, self-hosted, or CLI tool for turning OpenAPI (and other) definitions into a mock server, where you can modify behaviour, simulate downtime, and any other nonsnese you can think of thanks to a built-in code editor! SaaS / Java βœ… πŸ‘·
Microcks - Mocking and testing platform for API and microservices. Turn your OAI contract examples into ready to use mocks. Use examples to test and validate implementations according schema elements. Self-hosted / SaaS βœ… βœ…
API Sprout - Lightweight, blazing fast, cross-platform OpenAPI 3 mock server with validation cli / Docker ❌ βœ…

Server implementations

Name Language v2 v3 GitHub
Vert.x Web Api Contract - Create API endpoints with Vert.x 3 and OpenAPI 3 with automatic requests validation Java, Kotlin, JavaScript, Groovy, Ruby, Ceylon & Scala ❌ βœ…
BaucisJS + baucis-openapi3 - Create REST resources with persistence on MongoDB and expose OpenAPI v.3 contracts JavaScript ❌ βœ…
BaucisJS + baucis-swagger2 - Create REST resources with persistence on MongoDB and expose OpenAPI v.2 contracts JavaScript βœ… ❌
@smartrecruiters/openapi-first - Initializes your API express application with specification in OpenAPI Specification 3.0 format using provided middlewares (parsers, validators, controller, defaults setting) or custom ones Node.js ❌ βœ…

Miscellaneous

Name Language v2 v3 GitHub
Sway - A library that simplifies OpenAPI integrations/tooling. JavaScript ❌ ❌
openapi-diff - Utility for comparing two OpenAPI specifications. Java ❌ βœ…
$ oas (CLI) - Generate OAS files from code comments and easily host them ($ npm install oas -g) JavaScript βœ… βœ…

Parsers / Validators

Name Language v2 v3 GitHub
Speccy - Lint to enforce quality rules on your OpenAPI specifications CLI ❌ βœ…
swagger-parser - Swagger 1.0, 1.1, 1.2, 2.0 to OpenAPI Specification parser Java βœ… ❌
BigstickCarpet/swagger-parser - Swagger/OpenAPI 2.0 and 3.0 parser and validator. Can also bundle multiple files into one via `$ref`. Node.js βœ… βœ…
BigstickCarpet/swagger-cli - A handy cli tool for validating JSON or YAML files schema files that respects $ref Node.js / CLI βœ… βœ…
KaiZen OpenAPI Parser - High-performance Parser, Validator, and Java Object Model for OpenAPI 3.x Java ❌ βœ…
OpenAPI-TS - TS Model & utils for OpenAPI 3.0.x contracts TypeScript ❌ βœ…
kin-openapi - A Go library for handling OpenAPI 3.0 specifications Go ❌ βœ…
OpenAPI3-Rust - Rust serialization library for OpenAPI v3 Rust ❌ βœ…
psx-api - Parse and generate API specification formats PHP βœ… βœ…
openapi-spec-validator - OpenAPI aSpec validator Python ❌ βœ…
Microsoft/OpenAPI.NET - C# based parser with definition validation and migration support from V2 .NET βœ… βœ…
Dredd - Language-agnostic command-line tool for validating API description document against backend implementation of the API Javascript βœ… πŸ‘·
Sway - A library that simplifies OpenAPI integrations/tooling. JavaScript ❌ ❌
oval - CLI for (O)penAPI Specification document (val)idation. JavaScript βœ… πŸ‘·

Testing

Name Language v2 v3 GitHub
Dredd - Language-agnostic command-line tool for validating API description document against backend implementation of the API Javascript βœ… πŸ‘·
Swagger Inspector - Swagger Inspector is a free online tool to quickly execute any API request, validate its responses and generate a corresponding OpenAPI definition. Self-hosted/SaaS βœ… βœ…

SDK Generators

Name Language v2 v3 GitHub
OpenAPI Generator - A template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI definition (community-driven fork of swagger-codegen) Java βœ… βœ…
APIMatic CodeGen - Bring in your API description (OAI v2/v3, RAML, API Blueprint, WSDL, etc.) to generate fully functional SDKs in over 10 languages. SaaS βœ… βœ…
janephp/open-api - Generate a PHP Client API (PSR7 compatible) given a OpenAPI specification. PHP βœ… βœ…
go-swagger - Everything all in one. Parser, validator, generates spec from code, or code from spec! Go βœ… πŸ‘·