APIs.guru is a community-driven platform that provides a centralized directory of public REST API specifications in machine-readable formats such as OpenAPI (formerly Swagger). Its goal is to act as a "Wikipedia for Web APIs," enabling developers to easily discover, explore, and integrate APIs without manually searching for documentation across different providers.

The platform aggregates API definitions from various sources, standardizes them into OpenAPI formats, and continuously updates them to ensure accuracy and usability. It also filters out unreliable or private APIs, ensuring that the directory remains high quality and developer-friendly.

In addition to browsing APIs, developers can programmatically access the directory via a public API, retrieve specifications, and integrate them into tools for testing, documentation, or SDK generation. APIs.guru also supports tools like ReDoc for interactive API exploration and provides resources for contributing and maintaining API definitions.

Overall, APIs.guru simplifies API discovery and usage by providing a structured, open, and standardized ecosystem for working with public APIs.

Key features include:

• Large open-source directory of public API specifications
• Standardization into OpenAPI/Swagger formats
• Programmatic access via a public REST API
• Filtering of unreliable or private APIs
• Regular updates and community contributions

Common use cases include:

• Discovering public APIs
• Integrating API specifications into developer tools
• Generating SDKs or documentation
• Testing APIs with standardized schemas
• Researching available web services