Swagger & OpenAPI Studio
Create an OpenAPI specification with a guided endpoint builder, edit YAML or JSON, validate structure and internal references, and preview interactive Swagger documentation. No API calls are executed by the viewer.
Specification editor
Document outline
Swagger UI
Validate an OpenAPI document to render Swagger documentation here.
Normalized JSON
Validate to inspect the parsed document.
OpenAPI authoring guide
Required fields for OpenAPI 3.x are openapi, info.title, info.version and paths. Define an HTTP method under a path, document its parameters and responses, then add component schemas and $ref references as your API grows. Validation checks schema consistency as well as basic YAML/JSON syntax. This public tool supports internal #/… references only; external file/URL references are blocked for security. All editing happens in the browser, but validation sends the document to your own application server and does not persist it.