OpenAPI

OpenAPI is a specification for describing RESTful APIs in a machine-readable format, originally known as Swagger. It allows developers to define API endpoints, request/response structures, authentication methods, and other details using YAML or JSON. This enables automatic generation of documentation, client SDKs, and server stubs, improving API development and consumption.

Also known as: Swagger, OpenAPI Specification, OAS, Open API, Swagger Specification

Why learn OpenAPI?

Developers should learn OpenAPI when building or consuming REST APIs to ensure consistency, reduce manual documentation efforts, and facilitate integration. It is particularly useful in microservices architectures, API-first development, and for teams requiring automated testing and code generation, as it standardizes API descriptions across tools and platforms.

Learning Resources

• docs: OpenAPI Specification Documentation
• tutorial: Swagger Editor Tutorial
• video: OpenAPI 3.0 Tutorial on YouTube
• docs: OpenAPI Guide by Redocly