Categories
Tools for working with OpenAPI
There are many tools and resources available for working with OpenAPI. We've organized them into categories to help you find what you're looking for. If you're looking for a specific tool or resource, you can use the search bar at the top of the page.
If you feel like something is missing, check out our instructions on how to contributing.
Annotations
Use annotations in your code to generate OpenAPI definitions, keeping the documentation close to the implementation.
Code generators
Tools to generate code from your OpenAPI Spec, or to generate an OpenAPI Spec from your code.
Converters
Various tools to convert to and from OpenAPI and other API description formats.
Data Validators
Check to see if API requests and responses are lining up with the API description.
Documentation
Render API Description as HTML (or maybe a PDF) so slightly less technical people can figure out how to work with the API
Domain-Specific Languages (DSLs)
Writing YAML by hand is no fun, and maybe you don't want a GUI, so use a Domain Specific Language to write OpenAPI in your language of choice.
Gateways
API Gateways and related tools that have integrated support for OpenAPI.
HTTP Clients
Tools and libraries for making HTTP requests to APIs usually with a fancy GUI experience.
IDEs and GUI Editors
Visual editors help you design APIs without needing to memorize the entire OpenAPI specification.
Learning
Whether generating documentation for a third-party API based on traffic, or are trying to "catch up on design-first" at an organization with no OpenAPI at all, these "learning" (or traffic sniffing) tools can help you get there.
MCP
Tools that generate or work with Model Context Protocol (MCP) servers, helping AI agents hallucinate ever so slightly less than if the whole interaction was happening over screenshots.
Miscellaneous
Anything else that does stuff with OpenAPI but hasn't quite got enough to warrant its own category.
Mock Servers
Fake servers that take description document as input, then route incoming HTTP requests to example responses or dynamically generates examples.
Monitoring
Monitoring tools let you know what is going on in your API.
OpenAPI-aware Frameworks
There's a new breed of API-centric web application frameworks that produce OpenAPI for you from the actual code you're writing instead of messing with annotations or DSLs.
Parsers
Loads and read OpenAPI descriptions, so you can work with them programmatically.
Schema Validators
Check your API description or schema to see if it is valid OpenAPI.
SDK Generators
Generate code to give to consumers, to help them avoid interacting at a HTTP level.
Security
By poking around your OpenAPI description, some tools can look out for attack vectors you might not have noticed.
Server Implementations
Easily create and implement resources and routes for your APIs.
Testing
Quickly execute API requests and validate responses on the fly through command line or GUI interfaces.
Text Editors
Text editors give you visual feedback whilst you write OpenAPI, so you can see what docs might look like.